The best age for a hair transplant varies depending on individual circumstances, but generally speaking, it is recommended to wait until a person is in their mid-twenties to mid-thirties when hair loss is stabilized. This is because hair loss may continue to progress over time, and it is important to have sufficient donor hair for the transplant. It is also important to consider overall health and lifestyle factors before undergoing the procedure. Consulting with a qualified hair transplant specialist can help determine the best age for a hair transplant.