@Eric Sedletzky fwiw, this poll was repeated over on r/scuba:
After about 24 hours, that poll is trending with a nearly inverted age response from here, and ~4x more total voters. It does tell a story of two different sets of divers, with divergent age-related diver social media preferences. One thing I find interesting is that there's nearly 25x more poll responders for 29 & Under divers (542 vs 22 at the time I'm writing this) on reddit than sb.
This further backs up the suggestion that there are a lot of younger divers, they just aren't here on sb.