You can scan in old photographs. Most personal scanners can scan an old photograph, and you can buy specialty scanners that will scan in negatives or slides for you. I would probably just hire somebody to do it for me, though; if you only have a few that you need scanned, it doesn’t make sense to purchase equipment. If you have a lot of photographs to scan, then it’s not worth my time to do it by hand and I’ll probably get a better result from a commercial scanning company anyway.
I don’t have specific recommendations since this isn’t something I’ve had to do before; I know that there are quite a few companies that do it in my area and I’d probably use one of them as long as they were competitively priced just because I like to keep my money local whenever possible. To find one in your area, just search google for “scanning old photographs” and add in your city or state.