The Birthday Dinner

BL took me out for an amazing dinner Friday night at Indique Heights. The chicken chettinad was absolutely killer, and the atmosphere was more than I expected from a place in Friendship Heights. If you like Indian, it's definitely a place worth checking out, though admittedly a little on the expensive side.
BL and I were entertained this evening by a combination of our observations and our dorkiness, as usual. Since she was treating and I was being lazy, she chose the bottle of wine, and we waited to see how it would be presented. The waiter, true to the decade in which we live, presented her the bottle and poured her taste, then poured me the first glass. We both smiled. Dinner was rather uneventful, but definitely wonderful, and when we had finished, our waiter brought the check, and, once again, handed it to BL. This guy's good. He pays attention and he doesn't make the assumptions that are often made at a dinner for two. The assumption that the man will pay, that the man will choose and approve of the wine. It always pleases me to see that every once in a while that mold's broken.
But then, of course, the egalitarian bubble was popped. Another waiter came by and picked up the check from our table with BL's credit card inside. He ran the card, brought the check back, and...yep...you guessed it, handed the check with her card inside directly to me. Eh, you win some you lose some, but it's always interesting to watch.
Just as a little aside, I wonder how much age affects this phenomenon? Our waiter was young. Probably mid 20s. The second waiter was a bit older, probably mid to late 40s. Have we broken these assumptions somewhere in that 20 years in between?