Is it legal for the elderly in Hefei to enjoy the road?

Illegal. According to the Road Traffic Safety Law of the People's Republic of China, electric vehicles must be licensed on the road, but the old man can't. Unlisted old man music electric cars are illegal on the road. Since 2022, many cities have started to register and list such non-standard electric vehicles, and they are licensed for free. It is legal to license them nearby.