I don't have Photoshop because it's a bit too expensive for what I'd use it for. I never learned too much about how to use the free GIMP. So what I did was to use the photo editing tool that came with Windows 10, and a few on line free editing programs like Paint.net, Fotojet and BeFunky. I used them one after the other and it works.
First I cropped the photo to eliminate some of the image
that I didn't want and make it sort of a portrait.
Next I tried removing the old white specks that developed over the years.
I removed a great many of them, not perfect but very good. I also filtered in a sort of sepia color.
It helped hide the white spots and give the photo a warmer look.
Finally I used a function to make it into a portrait shape.
I wanted to frame it as a 5x7 but the photo printing site said it would not be clear enough. The 4x6 size would also not be clear enough but I'll take a chance on it.