User blog comment:Leviathan2186/Old Humans in Mass Effect/@comment-9753034-20130722161907

I don't know... I can instantly think of Helena Blake, Donnel Udina, Dr. Chakwas, and Dr. Zev Cohen, all of whom seem more or less elderly to me. Since interstellar travel has been possible for humans for less than 30 years throughout the trilogy, I'd imagine really old people haven't spread out across the galaxy as much as younger ones, and therefore aren't as likely to cross Shepard's path.