"Yeah," Dean agrees quietly. Hell, it's unsettling to realize that everything around him is years older, that he's going to outlive everything around him, even the people he cares about most. Sure, Cas and Sam will live a long, long time but that doesn't mean forever. It's sobering in a way he doesn't want to consider. Still, he shoves that back too, there's always time to think about it later - right now, he's focused on drinking the last of his bottle, and exhaling. "We've got the time."