I think you’re right on all these points, though it depends a bit on what part of the Fediverse you’re exposed to.

On the point of anti-capitalism, I agree, but (again, depending on the part of the Fediverse) there’s also an incredibly high amount of open-minded people here, compared to other more mainstream social media (like Reddit). I speak much from my perspective of being from lemmy.zip, which I’m impressed by the healthiness of the community since I joined. But there are also less “healthy” instances like lemmy.ml which is considered by many to be infested with tankies (anti-capitalism?).

And yes, the average age seems to be around mid-30s to me, based solely on how people speak and what they reminisce about.