Perhaps the plasticity of our brains is reduced, but that alone doesn't mean you have no brain power.
If you think of learning as "leveling up", you may stop increasing in level at some point, but you are still very powerful and productive.
I do agree with the sentiment of your last sentence however. We should endeavor to make our "leveling up" years count, and who knows, maybe you level up for the rest of your years.
Who knows. Maybe I have 40 years to go.
Whatever, I am fed up with looking back and thinking "if only" - so I shall try and minimise those by 60.
Hint: the two distinct prime factors of my current age add to 16 and I'm over 50
In the meantime I have to monetize the brainpower of the next twenty years to be able to retire :-)
But I would like it if I could make some cash by or along with contributing something worthwhile.
Nothing personal. Seems like a very common mistake, but I can't figure out why. I also see this mistake when people mention Sal Khan as Sal Kahn.
Yeah, I hear you about the "if only" thing.