From what I've seen it's the millennials, the ones who are supposed to be disinterested about everything, who employ a high-level of activism.

Millennials seem set to ruin one more thing: government corruption. The progressive revolution you see in the U.S. is also due to them.

It is always students that protest the most. Remember tiananmen square? Remember protests in Soviet Union satellite countries? Framing it as a millennials problem omits the actual pattern at work.

It is also not surprising. Who has the most incentive for long term sensibility in nation management? People that have many years left to live. On top of that students often live in ideological bubbles that are ripe with underutilized manpower.

Most of millennials are long out of school.

The pattern seems to be more about had that particular age cohort (generation) already tried protesting? If no, they will try it. It usually doesn't succeed, they will then never try it again.

Plus the students as you mentioned.

Interesting idea - each cohort wants to protest at least once.