Hey if Marcus was in the pendulum wars, 79 years before E-Day, how old is he in GOW? Darth tader,Talk to me, My Contribs 21:34, 4 March 2007 (UTC)
He wasn't there at the beginning of the pendulum Wars,he just was 37 years old I think At the start of the game. Marcus Fenix (contact the COG)
I remember a source saying that he was only 30 years old or something, but that depends on the age they're allowed to and the time they entered service. The age he may have is 32 years old to 45 years old. Silenced Nighthawk (Comlink) (Past Missions) 
Well what I don't get still is the pendulum war was 79 years before e-day, and thats GOW. Darth tader,Talk to me, My Contribs 03:07, 6 March 2007 (UTC)
Tader, He wasnt in the beggining of the pendulum wars, he was just there at the ending years. Marcus Fenix (contact the COG)
He's 35 years old, I just read it. That would explain it too. Silenced Nighthawk (Comlink) (Past Missions)
According to the entry in the main Wiki, here: http://en.wikipedia.org/wiki/Marcus_Fenix, Marcus is 35 at the time of the events in GoW. The Pendulum Wars began in 79 Before Emergence Day (B.E.D.) and only ended when the Locust Horde invaded on Emergence Day and started the Human-Locust War, which has lasted 14 years so far. So, Marcus was 21 in the year Emergence Day occurred, and was born (obviously) in 21 B.E.D., when the Pendulum Wars had been ongoing for 58 years. Commander, Starbase 23 22:36, 26 March 2007 (UTC)
Wrong! Marcus is like Chuck Norris. Immortal. Seriously though, the said he had 2 tours. So when did he actually join the military? 18?
He joined with Dom's bro, Carlos, when they were both 16 against both Mr Santiago and Prof. Fenix's wishes.