Wolverine is definitely over 100.
In believe the Stepford Cuckoos mentioned Emma being 37.
Xavier is probably in his 50's or even 60's.
Rogue is probably in her early or mid 20's as it was noted (I think by Moira) that she was not much older than Shadowcat.
Apocalypse is probably at least 4,000 years old. Actually, he should be dead by now, but the celestial technology has allowed him to extend his life (a la lazardus pit).
Jean, Cyclops, and Archangel are probably in their early to mid 30's, while Iceman maybe late 20's or early 30's.
out of which xmen....name a small group or something....Jubilee is proberly 16 or 17. Gambit and Rogue are early mid 20's Iceman is early mid 20's Wolverine is like a 120-135...Xavier is mid 40-early 50's. Sinister is over a 150. Storm is mid 30's Beast is too. Scott, Jean, Warren. Chamber is early 20's Husk is late teens....Cable is only 2 to 4 but he was raised in the future so he could be trained to controll is techno virus...he stayed in the future for like 42 to 45 years...so technically Cable is like 15 years older than his dad Scott....freaky stuff.or he at least looks older anyway.