I'm a millennial, same as magotan. I've wondered this same question myself. I've always assumed that most people here were born before the 90s.
One thing I have noted in the ex-jw community is that most content is aimed at older generations or is done by older ones. Not so many things done by younger people or in the typical YouTube style for videos. I'm not complaining since these videos are helpful many, it's just something I've noticed.