Well, 1914 is the current favorite hands down, and that's what I went with myself. Reagan was born in 1911, so 1914 seemed a more plausible choice out of the contenders.
Veering a bit off-topic, but I confess it irritates the hell out of me when people act secretive about their age. This has traditionally been a woman's prerogative, but more recently even some gay men have gotten in on the act. I mean--what's the big deal? Isn't being seventy-six, say, preferable to being, like, dead? And why can't we wear our ages like badges of honor, testaments to our resilience and fortitude in facing this frequently challenging world?
Just my two cents' worth on our free soapbox...