There is a thread being discussed on Zodiac Killer Site forum entitled 'Zodiac Minimum Age', for which I will post a link later, but it is attempting to narrow down Zodiac's likely age at the time of the four confirmed Zodiac attacks, along with the Cheri Jo Bates murder. Since the Bates murder in 1966 is yet to be fully incorporated into the Zodiac timeline as a definite Zodiac crime, the following analysis will examine the three attacks bearing eyewitnesses, along with the Zodiac communications, to narrow down a possible answer on the age of our killer during the years of 1968 and 1969. The following will be a personal opinion and by no means unequivocal, however the following will recollect under one banner the relevant eyewitness statements and what they actually stated about their assailant.
Michael Mageau survived the attack at Blue Rock Springs Park on July 4th/5th 1969. It can be said with confidence that Michael Mageau's recall of the events that night are sketchy, often contradicting himself in the police report, but his description of the killer is as follows: On page 6 of the police report Michael stated "A white man drove up in a car, got out, walked up to the car, shined flashlight inside and started shooting. Man was older than me." Michael was 19 years. Later on page 10 of the report Michael stated "Subject was not blubbery fat, but real beefy, possibly 195-200, or maybe even larger. Stated he had short curly hair, light brown, almost blond. States he just saw subject's face from the profile, side view, and does not recall seeing a front view. Michael reemphasized that he really did not get a good look at subject other than his profile. Stated subject was a white male, approximately 26-30 years." It is fair to say this is understandable, as the killer carried a high powered flashlight and began firing immediately upon arriving at the passenger side door of the Corvair. |

The Lake Berryessa attack on September 27th 1969.
Bryan Hartnell survived the vicious stabbing, whereas Cecelia Shepard died two days after the attack.
Cecelia Shepard saw the assailant unmasked at a distance for a brief period, but during the close quarter interaction with the young couple the Zodiac Killer was masked throughout.
Bryan Hartnell recollections were stated on page 23 of the police report "Victim thought suspect was possibly 20-30 years of age by voice concept."
The question here is how reliable is pinpointing somebodies age by the sound of their voice, hence the 10 year estimation range. Then finally the police got the best descriptions to date, when the Zodiac Killer continued his murderous campaign two weeks later in the heart of San Francisco.
Bryan Hartnell survived the vicious stabbing, whereas Cecelia Shepard died two days after the attack.
Cecelia Shepard saw the assailant unmasked at a distance for a brief period, but during the close quarter interaction with the young couple the Zodiac Killer was masked throughout.
Bryan Hartnell recollections were stated on page 23 of the police report "Victim thought suspect was possibly 20-30 years of age by voice concept."
The question here is how reliable is pinpointing somebodies age by the sound of their voice, hence the 10 year estimation range. Then finally the police got the best descriptions to date, when the Zodiac Killer continued his murderous campaign two weeks later in the heart of San Francisco.

Paul Stine was murdered in his taxicab on October 11th 1969 and was observed by three teenagers from a property across the road. The murder was logged at 9.58 pm, and their approximated distance was 50-60 feet away. A short time later Donald Fouke and Eric Zelms were driving along Jackson Street when the Zodiac Killer was spotted by Donald Fouke. Here are the respective parties descriptions of the killer.
The three teenagers stated the killer was "A white male, 25-30 years old, 5'8" to 5'9", stocky build, reddish-brown hair worn in a crew cut, heavy rimmed glasses and dark clothing."
Donald Fouke in his typed memorandum of 12th November 1969 stated he was a
"WMA, 35-45 yrs, about 5'10", 180-200 lbs, medium heavy build, barrel chested, medium complexion, light colored hair possibly graying in rear, crew cut, wearing glasses."
However on page 2 of the police report it mentions the Donald Fouke sighting of the killer with "reddish-blond hair and a man in his early forties".
Donald Fouke corroborated the teenagers sketch of the killer, with the appendum the killer was "likely older and heavier."
Summing up: Michael Mageau got what could be described as a fleeting glimpse of the killer, Bryan Hartnell estimated his age range on voice analysis, however the three teenagers and Donald Fouke viewed the killer for an extended period. The three teenagers, although affected by distance and street lighting, got an unrestricted view of the murderer for at least 3-5 seconds as the killer exited the taxicab, wiped down the passenger side and headed toward the driver side door. This is the time period where the teenagers got a full frontal, unobscured view of the Zodiac Killer's face.
Donald Fouke on the other hand stated he observed the suspect as he approached the intersection of Jackson and Maple. He stated in the documentary 'This is the Zodiac Speaking' "Slowed down as we passed him, we were still rolling, saw that it was a white male, step on the gas, 5, 10, 15 seconds tops from first spotting him to passing him." Combined, the three teenagers and Donald Fouke got the longest view of the Zodiac Killer by far. The question being, do we place more credence in Donald Fouke's description, being a police officer trained in observation and being distinctly closer to the Zodiac Killer than the three teenagers.
The three teenagers stated the killer was "A white male, 25-30 years old, 5'8" to 5'9", stocky build, reddish-brown hair worn in a crew cut, heavy rimmed glasses and dark clothing."
Donald Fouke in his typed memorandum of 12th November 1969 stated he was a
"WMA, 35-45 yrs, about 5'10", 180-200 lbs, medium heavy build, barrel chested, medium complexion, light colored hair possibly graying in rear, crew cut, wearing glasses."
However on page 2 of the police report it mentions the Donald Fouke sighting of the killer with "reddish-blond hair and a man in his early forties".
Donald Fouke corroborated the teenagers sketch of the killer, with the appendum the killer was "likely older and heavier."
Summing up: Michael Mageau got what could be described as a fleeting glimpse of the killer, Bryan Hartnell estimated his age range on voice analysis, however the three teenagers and Donald Fouke viewed the killer for an extended period. The three teenagers, although affected by distance and street lighting, got an unrestricted view of the murderer for at least 3-5 seconds as the killer exited the taxicab, wiped down the passenger side and headed toward the driver side door. This is the time period where the teenagers got a full frontal, unobscured view of the Zodiac Killer's face.
Donald Fouke on the other hand stated he observed the suspect as he approached the intersection of Jackson and Maple. He stated in the documentary 'This is the Zodiac Speaking' "Slowed down as we passed him, we were still rolling, saw that it was a white male, step on the gas, 5, 10, 15 seconds tops from first spotting him to passing him." Combined, the three teenagers and Donald Fouke got the longest view of the Zodiac Killer by far. The question being, do we place more credence in Donald Fouke's description, being a police officer trained in observation and being distinctly closer to the Zodiac Killer than the three teenagers.

If we take the median values of all the eyewitness estimations, Michael Mageau's 26-30 = 28, Bryan Hartnell's 20-30 = 25, the three teenagers 25-30 = 27.5 and Donald Fouke's 35-45 = 40. Combining all these median ages and dividing by 4 we get 28+25+27.5+40 = 120.5 / 4 = approximately 30 years.
If we take only people who actually saw Zodiac, then it is approx 32 years.
If we take the two longer sightings at Presidio Heights then it's 32.5 years.
Either way we have an age range of 30-33 years of age.
If we value Donald Fouke's description, being a trained observer, over the three teenagers then this estimation of 32.5 years would rise. It is important to factor in the time each eyewitness was observing the killer, in association with the distance they observed the killer from. In this respect Donald Fouke views the suspect closer and longer, followed by the teenagers and then Michael Mageau, who never furnished a sketch of the suspect at the time. If we valued the eyewitnesses in this format, then the likelihood is Donald Fouke's sighting would take top billing and raise the likely age of the Zodiac to the high 30's. It has been speculated that Donald Fouke stopped the Zodiac, based on the timeline, Zodiac's claim he was stopped in the 'Bus Bomb Letter' on November 9th 1969, statements by Armond Pelissetti in the documentary 'This is the Zodiac Speaking', reported statements of Diane Zelms (wife of Eric Zelms), who Eric allegedly told they stopped the Zodiac that night, and Donald Fouke's extensive description of the suspect walking on Jackson Street, detailed enough to suggest Zodiac was questioned that night. If this were the case then Donald Fouke's eyewitness description of '35-45 years' or 'a man in his early forties.' would carry far greater weight, placing Zodiac in the median range of 40-41 years of age. The argument is that if you believe the Zodiac Killer was stopped, then it is likely Zodiac is of the higher age range, in direct contradiction to the younger Zodiac suggested by the other five eyewitnesses. It is also important to remember that Donald Fouke stated in his memorandum one month after the murder of Paul Stine that the unknown male on Jackson Street was "possibly graying in the rear", coupled with a described widows peak, may suggest a man at least in his 30's. The average age for a man to start graying is 30-35 years.
If we take only people who actually saw Zodiac, then it is approx 32 years.
If we take the two longer sightings at Presidio Heights then it's 32.5 years.
Either way we have an age range of 30-33 years of age.
If we value Donald Fouke's description, being a trained observer, over the three teenagers then this estimation of 32.5 years would rise. It is important to factor in the time each eyewitness was observing the killer, in association with the distance they observed the killer from. In this respect Donald Fouke views the suspect closer and longer, followed by the teenagers and then Michael Mageau, who never furnished a sketch of the suspect at the time. If we valued the eyewitnesses in this format, then the likelihood is Donald Fouke's sighting would take top billing and raise the likely age of the Zodiac to the high 30's. It has been speculated that Donald Fouke stopped the Zodiac, based on the timeline, Zodiac's claim he was stopped in the 'Bus Bomb Letter' on November 9th 1969, statements by Armond Pelissetti in the documentary 'This is the Zodiac Speaking', reported statements of Diane Zelms (wife of Eric Zelms), who Eric allegedly told they stopped the Zodiac that night, and Donald Fouke's extensive description of the suspect walking on Jackson Street, detailed enough to suggest Zodiac was questioned that night. If this were the case then Donald Fouke's eyewitness description of '35-45 years' or 'a man in his early forties.' would carry far greater weight, placing Zodiac in the median range of 40-41 years of age. The argument is that if you believe the Zodiac Killer was stopped, then it is likely Zodiac is of the higher age range, in direct contradiction to the younger Zodiac suggested by the other five eyewitnesses. It is also important to remember that Donald Fouke stated in his memorandum one month after the murder of Paul Stine that the unknown male on Jackson Street was "possibly graying in the rear", coupled with a described widows peak, may suggest a man at least in his 30's. The average age for a man to start graying is 30-35 years.

Then we have the Zodiac correspondence and his reference to his victims as 'boy' and 'girl', suggesting a generational difference, along with his references from theatrical influences such as The Mikado (1885) and others, although these literary examples are not conclusive of age.
The question to be asked, is which eyewitnesses do you put the greatest weight of probability on. The median values averaged out, suggests the Zodiac Killer was likely 30-33 years of age in 1969. However I personally tend toward the eyewitness testimony of Donald Fouke, with an estimate of 35-45 years.
Taking this and everything else into account, my estimation is that Zodiac was 35-38 years of age in 1969. Please post your thoughts in the comments section below.
To view this topic on Zodiac Killer Site forum visit here http://www.zodiackillersite.com/viewtopic.php?f=33&t=2947
The question to be asked, is which eyewitnesses do you put the greatest weight of probability on. The median values averaged out, suggests the Zodiac Killer was likely 30-33 years of age in 1969. However I personally tend toward the eyewitness testimony of Donald Fouke, with an estimate of 35-45 years.
Taking this and everything else into account, my estimation is that Zodiac was 35-38 years of age in 1969. Please post your thoughts in the comments section below.
To view this topic on Zodiac Killer Site forum visit here http://www.zodiackillersite.com/viewtopic.php?f=33&t=2947