I would wait 5 years . I know it is tough , I started balding at 18 , it effected my life for years , it was painful and I know it may sound funny but it may have changed the course of my life . But I m glad I waited till 28 to get a HT . It is extremely important that you know or at least have a strong prediction of what your final Norwood will be to have your donor/recipient managed properly . Our donors are limited and very valuable .