Younger people can help evolve topics by providing a set of fresh eyes. It's also important to pass knowledge on, otherwise it just ends up dying with you.

For example: Virtual reality headsets were fairly stagnant until a young guy in his early 20s tried something new.

Old people often become stuck in their ways and it requires someone new to show up and ask how the sausage is made.

"fresh eyes" can still be the people new to the form who have that year just turned 35 (eg).

I was moderating forums when I was twelve. While I experience the usual “I was so embarrassing back then” when thinking back to those times, I do think my contributions were positive and well-received.

I used many old school forums in the pre-social media days. "Mature voices and thoughtful people" were quite rare.