I understand what you're trying to say, but I'm pretty sure that there are enough people on Youtube in their twenties.

I personally grew up with the internet in my teens.

And looking into the future - young generations are always more in touch with new tech than older generations. So I would try to get as many as possible to join Steem.

With that said: I do get what you're saying and yes, holding a conversation requires somewhat of a mental age, but it's dangerous to lump all kids & teens together,