Reddit mentions of The Owner's Manual for the Brain: Everyday Applications from Mind-Brain Research 3rd Edition

It was once thought that the brain loses its neuroplasticity with age, and that idea trickled down into the common assumptions people make, much like other old outdated science that had trickled down and people still assume it's true. It is not true. This is partly propagated by stories of famous scientists who did groundbreaking work when they were young, Einstein, Heisenberg etc. However, these stories are only well known because of their remarkable circumstances, and that does not make them general.

One example is here However I recommend searching for more rigorous research like this only this is dated, Im sure more recent work is available.

In short, the brain is not holding you back, it has the full potential to achieve whatever goals you set. Only attitudes about age and excuses will hold you back. Keep your mind open, learn as if everything you see is new for the first time and question things like a child would.

TLDR: do not let thinking about age get in the way of thinking about science.

P.S. I highly recommend this book

Both

The Owners Manual for the Brain By Pierce J. Howard

A User's Guide for the Brain John J. Ratey

Are great introduction books.