Castiel nodded, committing those dates to memory as well. "We could choose a day at random to celebrate Bobby's." Why humans attached such importance to the anniversaries of their births he wasn't quite sure, but he was happy to observe them if his friends enjoyed the ritual. That he himself didn't have a birthday was self-evident, and didn't bother him particularly, so he saw no reason to bring it up.

He smiled quietly at Sam's suggested. "I'd like that, too." He might never admit it, but sometimes he missed running the roads in that slow, confining automobile with his friends, stopping at whatever questionable hole-in-the-wall eatery they came across and listening bemusedly to the conversation he only half comprehended.