At what age sexual desire starts to decrease ?

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What is the most commonly known age for boys at which they start losing interest in sex , relatively lesser erections , desire ?I am a teen of 18 right now and have been masturbating since 12 , introvert with slim figure. When would I reach that point ? in 30s ?

I seem to recall reading that men start to slowly decline sexually from about 21, though its a very slow decent and of course Charlie Chaplin fathered children in his seventies. Women wierdly enough start their decline much later, which strikes me as odd bioligically speaking as they have a more definite end to their ability to produce children.

It's a very gradual process, and it depends a lot on your health and your lifestyle. Spontaneous erections may gradually disappear in the twenties, but apart from that you may not notice much change until the late 40s.

I guess between 18 and 23 but I would not say "lose interest," just that it peaks around that age, so from then on it may start to dwindle. For women I think it was mentioned already, between 40-45.

Fine I've also read that the peak of sexual desire is in age of 18-20