MC is 52 (or 53?) and T is 47 (possibly 48?)--I'm 40 (almost 41). As for how we found out, we just asked MC at one point (though graduation year of his undergrad diploma on wall gave us a clue). When I started seeing current T, he mentioned that he was 5 years younger than MC (they used to work together), so I figured that out.

And with ex-T, when I first started seeing her, she said she had kids my age, so I figured she was around my mother's age. Right near the end of when I was seeing her, I made some comment about what I thought her age was--I actually guessed lower. She's "very early 70s" (so I assume 70 or 71), which is a couple years older than my mom.