Hindustan Times Sperm mutations cause genetic disease

I just found this article in the Hindustan Times

"It is curious that although sperm have been around since the beginning of time, we know so little about what is in them, and what makes them tick, er, swim. So scientists spend a lot of their waking hours trying to compare the structure and content of the proteins of sperm in various species, in order to understand their evolution and origin. For instance, the mutated DNA in the genes of the sperm of older fathers is believed to cause many genetic diseases. It is almost as if a man’s biological clock accelerates mutation in sperm cells in his early ’30s."