I am 20 years old, can I now have a hair transplant?

The answer is no, you cannot have a hair transplant.  I also always perform bulk measurements with an instrument called HAIR CHECK which is a good way to determine just how much thinning you have that you cannot see. Once this test is done and you have gone a year, I often repeat the test as it gives an excellent measurement on what happened to your hair over the year. If it got better and some of the thinning reversed, maybe you won’t need a transplant and that is the goal that you should look to do. Of course, a good doctor is critical to this course.