Originally posted by ZephroCarnelian
Superman ages up to peak size and power, then doesn't get any older.The only way he can get olde ris if exposed to massive doses of Red Sunlight radiation.
This happened to Supes in the 'Superman 2020ad' PreCrisis Comics.
He got hit by a huge dose of Red Sunlight, which aged him very quickly till he had grey hair and wrinkles. He managed to get out of the sunlight in time to stop the aging but would forever look like that.
That was Kingdom Come Superman I believe,haven't read it though.