When I trained and eventually ran a marathon in 2008, I cut my hair short. After that I decided to grow my hair out but I noticed the longer my hair got, it got stringy so now I just keep it short.
Can I grow it long? Sure. But absolutely no volume and very stringy. The mop isn't there...
My hair has been receding since I was 23. I am now 31. I always had a thick mop on top of my head..really thick. My hair started to thin about 2 years ago and it's thinning pretty rapidly and my crown is thinning as well.
I also have had low levels of iron my whole life borderline iron...