I'm all for lowering the voting age to 17 IF we can lower the age limit for every other activity to that as well. Want to serve your country and put your life on the line? Props to you. Want to completely destroy your developing brain with weed and alcohol? I sincerely hope you don't (especially with weed, that shite needs to be banned), but at least the laws would be equal.
I don't think trans surgery should be a thing at all unless you are one of the extremely rare folks born with no or both sets of genitalia, so that's my thoughts there at least.