>16mm/35mm is already fading, with a finite population of prints that dwindles every year as film deteriorates or reels are lost/destroyed.

They are still publishing films in 35mm and at least in popular US cities the format has a following. For example in 2021, Last Night In Soho was printed in 35mm. To be fair the 35mm print was only exhibited in some select locations and only for special screenings. But then we also have 70mm IMAX that despite only has X number of screens left, still manages to attracts sold out screenings for weeks whenever a film (Like Oppenheimer) appears. I also spoke to the people running the Barrymore Film Center in Fort Lee, NJ (They screen 16mm, 35mm and 70mm and they promote Fort Lee as the birthplace of the American Motion Picture Industry). They told me that you can order up thousands of different 35mm films from studio's storage centers (I think there are only two left in the country) and the main issue is delivery costs make it usually not worth it to screen most films.

I am closer to middle age but I have met a lot of youngins who are die hard film people.