since it seems that slowness to change them sets in long before cognitive decline sets in.
I don’t think this is a dominant factor, but my impression is that cognitive decline sets in very early. (e.g. reaction speed peaks in mid-20s).
There was a recent paper that challenged that view. And crystallised intelligence likely peaks later than fluid intelligence. But yeah even if it turned out to be a non-trivial factor it’s likely not a dominant one until quite late.
I don’t think this is a dominant factor, but my impression is that cognitive decline sets in very early. (e.g. reaction speed peaks in mid-20s).
There was a recent paper that challenged that view. And crystallised intelligence likely peaks later than fluid intelligence. But yeah even if it turned out to be a non-trivial factor it’s likely not a dominant one until quite late.