Minimum age for sterilisation?


I’m only in my early 20s, but I’ve wanted to be sterilised since I was 16.
I have no interest in being pregnant or having biological children as it’s not important to me. I think adoption is an incredible thing and the I hate the thought of being on hormones for years and years for essentially no reason as my mind has never even swayed.

I was wondering if someone could tell me what the youngest age is that I would be genuinely considered for sterilisation?