Hey everyone! Does anybody know how old you need to be (in Australia) to have top surgery? Thanks

If you're under 18 years of age, parental consent is required to get FTM Top Surgery. From the WPATH Standards of Care:

Chest surgery in FtM patients could be carried out earlier, preferably after ample time of living in the desired gender role and after one year of testosterone treatment. The intent of this suggested sequence is to give adolescents sufficient opportunity to experience and socially adjust in a more masculine gender role, before undergoing irreversible surgery. However, different approaches may be more suitable, depending on an adolescent’s specific clinical situation and goals for gender identity expression.