The Freaks of Mayfair by E.F. Benson — Read

A fount of perennial youthfulness has been and will be the blessing and curse of certain people's existence. Up to the age of about thirty-five for a woman and round about forty for a man, it is an admirable thing to feel that the morning of life is still lingering in rosy cloudlets about you, but when these austere ages have been arrived at, it is wiser for those who still behave like imperishable children to recollect, impossible though they will find the realisation of it without exercising patience and determination, that, though their immortal souls are doubtless imperishable, they are no longer boys and girls. Otherwise the dreadful fate of becoming grizzly kittens will soon lay ambushes for them, and to be a grizzly kitten does not produce at all the same impression as being an imperishable child.

Like Erin in the song and King David in the psalm, they should remember and consider the days of old, and attempt quietly and constantly to do a little subtraction sum, whereby they will ascertain how far the days of old have receded from them. Their spring-tide has ebbed a long way since then: they are swimming in it no longer, they are not even paddling, but they are standing just a little gaunt and skinny high up on the beach, with wisps of dry sea-weed whistling round their emaciated ankles. Almost invariably those threatened with grizzly kittenhood are spare and thin, for this fact encourages the pathetic delusion that they have youthful figures, and in a dim light, to eyes that are losing their early pitilessness of vision they doubtless seem slim and youthful to themselves, though they rarely present this appearance to each other.