I think that depends on how you use Reddit. You're right, there are lots of teens on there, but I'm not subscribed to the subreddits they frequent, nor do I browse r/all, which is the equivalent of Youtube's "Trending" tab.
r/webdev for instance is one of the subs I'm subscribed to, and the culture there is not really meme or inside joke-oriented like a lot of the entertainment-type subs are.
The other day I was googling info related to legal review of real estate documents, and my top search results were all keyword-heavy content mill articles that weren't helpful at all. I decided to do the same search with "site:reddit.com" added, and the information was much better, as you're often hearing people's stories of working with lawyers when buying property. It was very helpful to get this kind of 'organic' information instead of the 'corporatized' version that's really a lead-up to their sales pitch.