Truly amazing what modern science and technology can do. The girl (aka ex-boy) will probably never start balding like her father (who is in another non-youtube video). The boy (aka ex-girl) will on the other hand now have to deal with androgenetic alopecia if it runs in his family.
MTF (male to female) transitioning and its impact on hair loss are far more interesting to see in older transsexuals who are already balding prior to transitioning. A must follow is Danielle Hallet (@daniellehallett) on Twitter. She has had a number of hair transplants while transitioning, since she had lost most of her hair prior to beginning the MTF journey. On her website you will find a number of before and after photos if you look through the archives.