Experience, I could see. You know how you like your coffee after a thousand years. Who you loved, who you wasted your time with. Do you replay crap, sometimes? Or, does it disappear? Over time, do you just forget a whole chunk of your life?

( Vampires always "remember," especially in TV. But, is memory like that? Not everyone is Dean and Sam Winchester who remember a case from fifteen years before. But not everyone rereads their dad's journal as often as they do. (Sam would admit to it, Dean wouldn't.) )