I do get treated differently when people find out how old I am. Largely, that's because I act a good 10 years young than people suppose I should and I work around college age kids. For some reason, anyone over 30, to them, is nearly dead so to have humour, a sex life or understanding appears to blow them away. When they ask I will tell them, yet I do make them ask first more as a way to get them to shatter their perceptions. They always guess 5-10 years younger. They will guess closer to my age when I mention being around for this or that.
If people didn't treat me differently, I wouldn't be nearly as reticent, at all. Yet, it would go counter to my very private nature.