What are all the reasons as to why we get gray hair, no matter the age?

genetics.

I think one of the reason is worrying, and thinking too much. and the other reason might be genetic or medical.

Genetics and stress.

so we can spend alot on hair dyes!

I've been getting gray since I was 25!! Viva la Loreal!!!

I'm not sure. What I can do is describe the experience.

My hair was brown and thick my whole life. As a kid it was always buzz cut. In early teen I used a lot of grease in it to maintain my cool look. Late teens and after the military it was long as like in a hippy movie. In the military it was buzzed except for 14 months overseas where I got away with long hair believe it or not. After settleing down around age 24 I have always maintained it just over the ears and off the collar.

Near 50 it started to grey very slowly. The more grey the more thin my hair got on top. Now the top of my head almost shines and the sides and back are thick as ever.

The slow greying and falling out reminds me of Autumn. Where the leaves turn color and fall to the ground.

Soon I will be in my winter. lol.

as we get older our bodies quiet producing certain vidims that keep us young looking.unfortunaly don't help us spell better eighter.lol