Can you be able to make your wife pregnant with only one testicle that produce 5000000 sperm maximum at age 48 and my wife 43yrs?

It only takes one sperm and one testis is usually no problem. I think the problem here is not your sperm but her age. By the age of 30 women only have 50% left of their eggs and by the time they are 40 they only have 20% left. Many women also don't ovulate every months either. Talk to your doctor and have him set up her ovulation schedule so you know when she ovulates and focus on having sex then. Otherwise in vitro might be your best chance. So talk to your doctor. You must have talked to him already or you never would've gotten the number 5 million.