Q: I am 26 years old, have had two successful hair transplants, but am still losing hair in the crown area. The doctor I have worked with told me that he does not do crown work on anyone until they are at least 40 (due to lack of donor area). I have very thick hair and the transplanted area looks as if nothing was lost. Would you do work on someone my age in their crown area if they have enough donor hair? — A.W., Brooklyn, N.Y.

A: Although I am hesitant to start with the crown when transplanting a younger person, if you have good coverage on the front and top of your scalp from the first two sessions then extending the hair transplant into your crown may be reasonable. It depends upon your remaining donor supply and an assessment of how bald you will become. I would need to examine you.

If it is likely that you will progress only to a Norwood Class 6, then transplanting your crown can be considered. If you will progress to a Class 7 then you should not since, in the long term, hair that was placed in the crown might be better used for other purposes, such as connecting the transplanted top to receding sides.