Can I remake very old black and white photos? Is a general photo studio all right? How about the price?

You can totally remake it. Black and white photos are all film, which is much higher than the current digital pixels. It is completely reproducible and magnified.

You can take photos with a higher pixel camera, scan with a higher resolution scanner, and copy files to a USB flash drive for the external photo library, all of which can make some corrections for you. If you have a color printer in your home or office, you can even omit this step. Go to any PS enthusiast website to post for help, and ask others to help you modify your photos (many old photos are posted online), and then print them out in the printer.

There is a Sichuan store called Shi Tian Wanghua, which also does online transactions. It can make a modified photo for you, send it to you or print it out, which is charged.