Alexander Freer was riding his 50cc scooter to a grocery store on Friday afternoon when he was struck by a van in Glasgow's south side. He was thrown off the vehicle by the impact.
Passers-by rushed to help him and called emergency services. He was taken to the Victoria Infirmary and was found to have a broken pelvis and injuries to his face and hands.
Police are trying to trace the driver of the white Ford Escort van, which failed to stop. They are studying CCTV footage and have asked any witnesses to contact them.
Mr Freer, from Toryglen, said: "It is upsetting to think someone would just drive off."
The accident happened at the Pollokshaws Road junction with Kilmarnock Road, near the Granary pub.
Mr Freer said: "I was on my way to Thornliebank because I do my shopping there.
"I was just approaching the pedestrian crossing. I was doing only about 15mph and got an awful smash on the side.
"He was in the outside lane. I never saw or heard him. I was thrown off my bike. I saw the van disappear and, next thing I knew, people were round me."
He added: "I have been driving cars and bikes for 55 years, but I don't think I will be driving any more. I will just take the bus."