Tube tying at a young age

So I am 21 and thinking seriously about getting my tubes tied. I was adopted from China as a baby. So as you imagine I have no way of digging up any family medical history. My whole life whenever doctors ask me about medical history I have to say that I don't know. After being diagnosed with scoliosis when I was 14 I wondered what else could be in my family history. And I don't want to have to explain that to doctors with my own children. I do want kids and I plan on adopting. I just don't want biological kids. But I have read that some doctors will refuse or discourage tube tying on women under 35 unless they have health problems. Has anybody else had the procedure done and not been over 35?