So the latest theory is that the brain doesn’t need to lose nerve cells as it ages, this not as much as once thought. What was originally speculated was up to 1% percent of neurons was lost every year once reaching the age of 25. This is now thought to be false, this for certain neurodegenerative diseases.
The thinking now is there’s no need to lose any mental function as the aging process sets in. Although you might slow down a bit, it’s thought you won’t dumb down. There is …