Yes, we use them, and it HAS come up in one of our games, to my character, actually. Between adventures (since there is a long rl time lapse between when we play.. we only play 3 times a year) there is always a span in character where our characters go back to what they are doing, which is things like ruling towns and researching spells, since we are high level PCs. When we converted our old game to 3E, we advanced our timeline 12 years, which put my character in an older age range, hence changing of stats.
Also, if you roll for age as seen in the 3E PHB, wizards and clerics arn't realistically sixteen anyway, it is more likely to come up in a game.
~~Brandon