@halo_9 I got mine when I was 17, depends on the body, nutrition and the stress intake, sadly ginaclogical studys are still very far behind so there isn't a clear reason why other then the three reason mentioned (I say this with the knowledge of working in the NHS)
@halo_9 lmao I started mine at 14, but it was irregular, so I only had 3 my first year, and my second and third year only had about a total of like maybe 14. But now I'm on track and I really wish I wasn't sometimes lol. I also know someone that didn't get thiers until they were 18. But that was a really long time ago, she was my grandpa's girlfriend.