[nickd2001]

Also some of what may be perceived as cognitive decline is simply being distracted and tired from raising a family. The brain-power may come back later once kids are older and caring responsibilities get less. (though that may not happen if you got elderly relatives to then care for. also from what I hear adult "kids" can be quite a distraction too ;) ). I remember being amazed at my grandmother in her 80s still having such a sharp mind, reading sci-fi, beating others at chess or card games. But of course, she had no responsibilities any more, could have a lie-in if needed, not worn out from work etc. I'd guess she may have seemed sharper mentally at 80 than 50. I have another relative like that too, 80 and very sharp.