Faye I invariably read posts carefully.
If someone feels, say 25 mentally, but is, in fact, 70, then surely she has stopped developing and growing and has no use for the experience and wisdom she might have gained in the intervening 45 years. If, however, she has taken on board the experience and wisdom of those 45 years, then she is deluding herself if she believes that she still feels 25 mentally. It is not possible to feel both 25 and 70 in one's mind simultaneously. I recognise that it sometimes seems something of a surprise or, indeed, a shock to realise how quickly one has become old but that is a different matter all together.