Knowledge helps too. To me, teens can only add what they have experienced, since their knowledge base is often limited. Just like others though, imo, their views are shaped by their experiences.
By the time I was in my 20s I had had many experiences and had added established knowledge to that. However, even with that, my counseling/advice to others, say about how to raise a child, was not accepted merely because of my age. (Even though it might have been the exact same counseling that would have been given by someone older than I!)
But this site is not about knowledge, remember? It's about support: giving and receiving. We are fortunate when another member also has good information, too.