What if humans lived on average to be around 500 years old? How would this change your decision making? We'd all be SUPER young in such a world. It would be really weird. So if we all had a good 400-500 years easy on top of our current ages, how weird would that be? What would you look forward to seeing in that many years? Would you even want to be around that long? Imagine being able to talk to people who were 400+ years old. That would be some serious history to talk about.