that's fair. i went off the AI generated answer. here's some links, i was off but the number is still significant.

50% users under 30 (gen z). only counts 18-30, estimate as you will for those under 18 (to be fair she only referenced gen z): https://explodingtopics.com/blog/tiktok-demographics

total users in US is 170M: https://backlinko.com/tiktok-users

your call on if 85M users 18-30 is "[gen z] society".