I don't consider myself a "kid" at 25, but I'm sure some would. I'm also very comfortable with social media so participate both here and on groups on Facebook. This forum isn't dead by any means, but groups on social media do tend to be a little more lively.
As previously said, information on here can be more accurate, I think due to a few factors:
a) Most users on here have more experience whereas many of the groups on social media are flooded with beginners (some more open to reason than others)
b) There's more space for detailed discussion
c) Threads are easier to follow, which encourages those who care about the subject to post more, which encourages dedicated hobbyists etc.
I guess it's down to the individual whether they'd prefer to wait a while for more accurate information or maybe a challenging discussion, or whether they'd prefer to have a barrage of information very quickly but much of that may well be completely false. That said, I cannot praise the admins in one of my FB groups enough as they have an incredible amount of knowledge, dedication, and patience, whereas some of the advice I see on here makes me wince and there are certain topics I just completely avoid. I still much prefer this site over all though
Essentially, there's pros and cons to both types of forum in my personal opinion, but it's not as clear cut as one being better than the other and it doesn't just come down to age.
Edited to add: There's actually a lot of older people in the facebook groups I frequent. Some are brilliantly helpful and knowledgeable. Some defend horrendous fishkeeping with the excuse "I've been doing it for years."