I would tell friends, family, random strangers, the postman and shout it from the rooftops, if anybody cared.
But if someone does not want to tell their age (I'm not using "reveal" because that implies that's a secret to be kept in the first place) it's presumably because they have been, or feel they will be judged for it, in one way or another. Maybe in a positive way, as in "wow, you look great for your age", maybe in a negative way. And maybe they just don't want to talk about whether they fulfill somebody else's ideas of age or not.
Womens magazines are continuously telling us how to look young and fabulous at every age, assuming 1. looking fabulous is what we all aspire to 2. looking young is really important. Nothing wrong with a little vanity, but on a daily basis I consider my age about as relevant as my height and shoe size.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett