Concerned about mom's boyfriend?

Ive posted a question before about him and medical alert bracelets. He has type 1 diabetes and hes almost 50. His docters didnt think he would live to see 20 but he doesnt seem to have any health issues other than eye problems that were taken care of by laser surgery. In the 8 monthes theyve been dating hes never had any issues other than his blood sugar getting low once and all he had to do was drink some orange juice and he was fine. he eats a lot but he only has a little bit of a gut and seems physicaly fit. Hes up to 6-7 insulin shots a day. I dont want anything to happen to him because hes the first guy to ever really treat my mom the way she deserves. If he's made it this far, will he probably live to have a normal life expectancy?