I would appreciate your opinions on late motherhood and especially late fatherhood?

Is it plain selfishness on the parents-to-be side? How late is late? Is a man becoming a father mid-fifties very extreme? Logic says it is toooooo late. Can you see the good in it? I would also like personal experiences if possible.

It must hurt a child to go to school and be told – “Grandpa/ma is here to pick you up”, when it is actually you parent.