As young as 16?????? What ever happened to parental consent?????

Christine, I believe that in most parts of the UK 16 is considered age of majority and therefore parental consent is not required. I could be mistaken about that though.
For most purposes, it's 18. You'd be considered an adult at 18 and be able to vote, drink, etc. The 'age of consent' for sex is 16 though (for both heterosexuals and homsexuals now - used to be 18 for homosexual men until 2003)
Consent for medical treatment isn't really that straightforward though.
Basically, you are assumed to be legally competent to give consent once you turn 16, but this is a rebuttable presumption. The Department of Health still recommends that it is nevertheless good practice to encourage children of this age to involve their families in decisions about their care, unless it would not be in their interests to do so.
If the child is under 16, they are assumed not to be legally competent but, again, this is a rebuttable presumption. A child under 16 can still establish competency through the rule in
Gillick v West Norfolk & Wisbech Health Authority. That case established a number of questions that have to be asked, but it basically boils down to the risks, complexity, and potential consequences of surgery (it is much more likely that a child will be held capable of consenting to a relatively straightforward procedure) and factors such as age, level of education, and the information made available by the surgeon. For the most part, parents cannot override the wishes of a competent child and confidentiality must also be respected in such circumstances. However, a child aged 16-18 cannot refuse treatment if it has been agreed by a person with parental responsibility, or by a court, and it is in their best interests.
If that sounds a bit complicated, trust me, it's actually an over-simplification!
On the main issue though:
I think it's very sad that people - especially young people - feel so pressured to conform to a template that they consider such extreme measures. The concept of a singular definition of beauty is rather an odd one.