Elon Musk is a great example of what is possible with hair transplants. He had severe balding at a very young age, and you would never know it today. I have a feeling that public perception of him would be quite a bit different if he still looked like his old self. Here is a before and after...the “before” image was taken in 2002:

https://pagesix-com.cdn.ampproject.org/i/s/pagesix.com/wp-co...