White Hair

When I look at the mirror, I always see my white hair.
Though the white hair is not too much, but it's already a little more for my age.
This is caused by my job.
My job is all about writing, any kind of reports, applications, certificate, etc.
It seems like a light work, just sitting at desk and tapping on the keyboard, but it indeed cost too much energe. I have to use my brain all the time.
I have met a lot of people whose jobs are similar with mine. They also have white hair.
After so many years of accumulation, I have a lot of experience on composing these things, but it still overtax my brain.
If my white hair a little more than ever, I know I need more time to rest.