Can Nature Make a Big Change in Aging?

I really demonstrated pretty convincingly that the opossum, one of the things that i wanted to find out by studying the opossums on the island versus the mainland is how fast does nature change the aging rate? And cause we knew the island i was working on was about five thousand years old. So in five thousand years, could nature make a big change in aging? It turns they could. I still think it's a fascinating issue. Another interesting modern organism that actually you mention before wis the opossom. You mention that a person that is much bigger than mice lived similarly to mice. So can you speculate why it? I wish i could say more about that.