How old is Superman?
The character has existed for over 65 years (see Q10). Clark was 25 when he became Superman, and the post-Crisis (see Q12, Q13, Q14) stories recount his adventures beginning at age 28 (SUPERMAN #1, Jan 87). Clark was 34 when Doomsday killed him (NEWSTIME, May 1993; ZERO HOUR #0, Sept 1994). Though flashbacks and stories of his early years may show a younger Clark/Superman, current stories show him at the age of between 37-42. Due to his alien heritage, it is unknown whether Superman will continue to age and grow old at the rate humans do, but his rate of maturity has till now matched that of humans.
