How old do you have to be to get fat transfer to the butt ?

Assuming it is for cosmetic enhancement, most surgeons would recommend the patient be at least 18 years of age. Glad to help.

You have to be at least 18 years of age. There is not age limit thereafter as long as the patient is healthy and a candidate for surgery.

You should be at least 18 years old.Try to research this to find the surgeon who consistently produces the
results you would expect. Look at reviews on this site and see who gets the surgery right every time. Find
a board certified plastic surgeon who performs hundreds of Brazilian
buttlifts each year. Then look at the plastic surgeon's
website before and after photo galleries to get a sense of who can
deliver the results. Kenneth Hughes, MDLos Angeles, CA

Hello dear!
Thanks for the question and provided information as well.
You should be at least 18 years old to be a candidate for plastic surgery.
In general, you need to be physically healthy and at a stable weight, have realistic expectations, be a non-smoker and your BMI needs to be 30 or less.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)

There is not specific age minimum, but I think most surgeons would wait until you are at least 18 and could consent to the procedure.

In general for buttock augmentation I would recommend that you be full mature.  Typically this is for adults 18 or older.  A detailed consultation with a board certified plastic surgeon comfortable with buttock augmentation and body contouring can help you make an informed decision.