There is a lot of talk about how our brains have certain windows of
opportunity for learning.
If you do not get that knowledge in there you missed it.
Not only that but if you are over 40 forget it!
There are studies now that conclude quite to opposite. Here is an article
on middle age brain:

So not only we, the middle age ones, are happier and smarter but we can learn as
much and well as

young ones.
Alex Polikowsky

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