User blog comment:Blinkn/How Old Are They?/@comment-4651179-20140914052911

Magneto is younger than Cap. He was still a child (10 years as much) during WWII, while Cap was in his mid 20s.

Cable could be in his 50s.

Franklin is still a kid (6 years old approx) because he has been de-aged after being aged.

Supposedly, Valeria is 2 years old. If I'm not mistaken, that's what Tom Brevoort said in his Tumblr (with Franklin being 4). Honestly, I think they are, at least, a couple of years older than that.

Spider-Man is 28 years old, aprox. He was bit by the radioactive spider when he was 15 years old. And in Amazing Spider-Man (Vol. 3) #1, it was stated said event happened 13 years ago.

And Iron Man is 35 years old.