Hi Nat,
do you mean scanned films or scanned prints?
The process was first to process the film, and then go on to make prints. In the former Soviet Union, for b/w prints, everything was made at home with a simple equipment; for color, unless you are professional, you would have to go to a shop. Btw colored photographs were usually for producing slides, and people did not make prints but rather projected them on the screen. Now, scanning film is difficult and requires special equipment, but scanning prints only requires a standard scanner.
Most people stopped using film in around 2000. and thus they are not so old now (they would typically start taking pictures at 10-15, and, for example, I am 55 now and I still had 25 years of film experience). The problems are more that prints get lost or stayed behind as people are moving, and that after 30 years they are not exactly sure what they were filming. I would suggest a special nomination for scans of prints, if it still can be done this year (though you have to be extra careful to make sure people scan their own photographs).
For professional photographers, this is a never-ending story but I would start with professional societies.
Best
Yaroslav