That Cheers actor Kelsey Grammer gets an eighth child at the age of 70 is fun for him, but not normal. One in six couples has to deal with reduced fertility. What does that lie? To age, lifestyle, genetic predisposition and a reduced quality of both egg and sperm. The man’s sperm quality is not going well. A fertility doctor and an embryologist explain: “Although men can have children up to old age, there are consequences.”

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