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At what age does a mans sperm stop working to get a girl pregnant?

I know I shouldn't be asking something like this but I am...because I have 2 friends and they want to have a baby together but they aren't financially stabled and child protection services has already took her other 2 children so I don't ever want her getting pregnant with her boyfriend especially cause she's 21 and he's 40+

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Humanist321 · M

Well, a man's sperm is still viable so long as he is able to ejaculate, unless he has his sperm ducts cut, which many men do because it is easier than using a condom if you are past the point when you want to make children. The short answer is that most men are capable (short of some medical reason) until they are in their 70s.