I mean, it's not like he chose to die then. It wasn't like when I jumped off that platform into the sunset (or sunrise as the case may be) or you when you jumped off that building.
But he's really back? And hey with the Seed created again, we can figure out a way to age him back up. Maybe get him to the point where he can buy whiskey again. I bet that'd make him happy. He drank a lot of it toward the end of Sunnydale.