The earliest 24-hour supermarket chain in Japan was 7- 1 1, which was founded in 1973.

It's been 45 years.

-

If you mean the kind of non-chain, self-operated small shops, many of them should have a history of at least 60~70 years.

Because land in Japan can be privately owned. Therefore, convenience store owners can generally continue to operate as long as they don't close the door.