It’s important for their mental enrichment.

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I used to play dnd with an astronaught

I’m similar, except I collect rpg books and I’m 30. I haven’t sat down read a paper book properly in years, I just don’t have the attention span (thanks undiagnosed ADD). But I keep collecting because it brings me joy to do so and I enjoy the thrill of the chase going through second hand bookshops looking for deals.

These sort of hobbies are also great for bringing together like minded people, like you and your friend, so there are additional social benefits to them too if you’re looking for that. This is something Ive come to really come to appreciate more as I’ve aged and fallen out of contact with school friends and it gets harder to meet new people outside of your social circle.

Sorry for the ramble but I guess my main point is to ask yourself whether it brings you joy to continue collecting or not and if it doesn’t maybe to hold off for a few months and check back in with yourself then as you may feel different.