The majority of film photography videos on youtube is by a younger demographic (let's go with <35 yo), but it isn't overwhelmingly so. I can think of many youtubers who are more seasoned and produce content that regularly or exclusively shows film photography content. Steve O'nions, the Slanted lens, Shoot film like a boss, Craig Sheaks, Azriel Knight, Darkroom Dave (maybe stopped a year ago), Tim Layton, Trangent, Hood's photography (maybe stopped), and on and on. I am really missing others, I know. I just can't come up with their channel names at the moment.
Actually, now that I think about the film channels I'm struck by a couple of things: more newer channels pop up than older channels drop out, the range of demographics of content providers is varied, too. It's male dominated, but not exclusively so. (I don't know of any older women with film channels.) Lina Bessonova has an excellent channel. These channels also span a wide range of experiences from newcomers, returners, to former Ilford employees (Steve O'nions and Darkroom Dave) and college photography professors (Trangent).
Film isn't going to be a billion roll a year enterprise again, but the tea leaves seem to show that there is a resurgence of public interest in film photography. I'm happy about it.