Oh boy. I have a large box full of old photos. My father liked (for me) to shoot Kodachrome slides; the last time I looked at my Philmont Scout Ranch photos, 20+ years ago, they were fading.
My dad’s slides are in a sealed metal box, and I have an URL for a site that sells a slide/negative scanner/copier that send the data right to the computer, but I don’t have the money to get it, just yet.
It’s “only” $100, but it will have to wait a bit. As for the 16 mm films...that will have to be done professionally, I think. I haven’t heard of any machine that I can afford that can do it.