I don't know. I'm pretty darn old and since I no longer work at a mindless, mundane, non-thinking, robotic job,
I now have time to read literature, metaphysics, physics, history, philosophy. Give to create, invent, sculpt, paint, write.
My mind is a hundred times more active then when I was younger, but it's as if I just "woke up", or just landed on the Earth.
I don't think age has much to do with it. I think "health" is a great factor though!
OK, Not the best world or the greatest people but we are stuck here temporarily so why not reinvent ourselves and learn as
much as we can, grow our character and strength of thought as best we can?
Your life is not "who you used to be". Your life is NOW!