A 60 year old man can reliably have children. It is essentially impossible for a 60 year old woman to have children. The risk of defects from poor sperm increase from about 2% in your twenties to 4% in your sixties.
However, men do have a biological clock and that clock is simply that they are proxied to women's clocks. Mick Jagger can get a young girlfriend and have babies in his old age because he is famous with lots of money. The typical man cannot do this and should not plan on being able to do this. The data tells us that if a man reaches 45 without children, it is extremely unlikely that he will ever have kids, even if his sperm tests perfectly in the lab.
However, men do have a biological clock and that clock is simply that they are proxied to women's clocks. Mick Jagger can get a young girlfriend and have babies in his old age because he is famous with lots of money. The typical man cannot do this and should not plan on being able to do this. The data tells us that if a man reaches 45 without children, it is extremely unlikely that he will ever have kids, even if his sperm tests perfectly in the lab.