Pakistan’s prime minister (the most important leader in the country, as opposed to the president who holds that title in the US) underwent a hair transplant around five years ago:

Although successful at the time, it seemed like the prime minister lost his transplanted hair per more recent photos:

However, if you google news his name for the most recent photos, it seems like his hair is back, albeit not as plentiful as immediately post his first transplant.

My feeling has always been that a hair transplant is not permanent for many people, as the “permanent” donor region at the back of the scalp is not permanent in numerous men. My donor region hair in my 30s is already less dense than it was in my 20s. My grandfather on my mother’s side had no hair at all in his “permanent” donor region in his 80s, and probably very little in his 70s. He died at the age of 87, very secure in his complete baldness.