I don't think you need to be at peak cognitive power for your contributions to be measurable and worth doing in society. No one would care about the age of the

I don't think you need to be at peak cognitive power for your contributions to be measurable and worth doing in society. No one would care about the age of the person who finds treatment for an autoimmune or teleportation. Sure, you'll be delivering slower than what you would if you were 25 but slower is better than not delivering whatever unique you have to offer at all.