My parents have a large collection of 50-ish year old 35mm slides. The collection starts before their wedding and runs through my youngest sister’s birth – a range of more than 20 years. They wanted to go through, sort the pictures, and save the good ones. But they discovered that their old Argus slide projector didn’t work any more. Most of the slides were stored on long straight trays (not the more common carousel style). With some Ebay purchases and some part swapping they were able to get a mostly working projector. But, the effort involved really illustrated that we needed to digitize the pictures while hardware to scan them was still available. And while my parents were still around to help caption the photos.