I'm 60+ now. My late wife and I were not able to have children and we never found out why. We had lots of tests in the 1980s but we never found out what the problem was. It still makes me sad that I never had the chance to be a Dad or Granddad. Dad died when I was little and Mum when I was in my teens but that wouldn't have mattered nearly so much if I could have had children.