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Average person: 0-18: Learning; 18-65: more or less on the same intellectual level; 65+: doing absolutely nothing intellectually challenging;

It is only natural that a brain adapts to decreased pressure. Having a large brain costs a lot of energy, which it could apparently spend in better ways.

The people you know who are 65+ must be different from those I know. The same for people 18-65.
I think the average person tends to use their brain less and less over time. It's only logical that this might cause loss of brain mass.

The opinion expressed in the article that a need to care for children could be the reason seems completely baseless to me.