Since day 1 I have questioned the relevance and need for boomer only sites. To reiterate, I don't think boomers have a need to hang out together on age specific sites at least not to the point that they will join and pay for it. Facebook is no longer the private domain of younger people as the 40+ crowd has moved in and found the various niches which interest them. I don't want to say "I told you so" but go and look at my posting here and see how many of these sites are still around.
theBoomerTube collects videos (mainly from Youtube right now) that are supposedly of interest to boomers. I guess this is a good idea but it's only going to be successful in the long run if it manages to attract members who post videos. Just being a filter for Youtube isn't much different than a user going to Youtube and searching for something he/she is interested in.
The problem I see with all boomer sites like this is that they are "me-too" sites that hope to attract boomers/seniors. It doesn't bother me other than the fact that people keep trying to take a run at a market that I have yet to see take off on the internet. That's not to say that's it's not possible but wouldn't you think that someone would have figured it out by now?
Anyway, good luck to theBoomerTube which is not a pay site.