I have to be honest with you. I do not have as much hair as I used to. Look at me up there! Look at all that hair! And yet, where has it all gone? Well, there are a few reasons for what has happened.
1) Today is my birthday. I am another year older. As people get older, things happen to their hair. It turns new colors. It moves around to new body area locations. It evaporates. Not much I can do about that.
2) Genetics. Because, as you know, some people just get old and continue to have luscious hair. This is because they are jerks, but also because they have better hair genetics than anyone else. And I think I read somewhere that they are mutants of some sort, so when the Sentinel robots come, they are coming for the well-haired first. This is a small consolation. I did not win the hairy mutant lottery.
3) And finally, there is one other obvious reason that my scalp contains fewer follicles than in the past. And I would explain more about these specific reasons, except I have to go help them get their shoes on before they yank out any more precious strands.