Hello, have you colored your hair before? It is practice of changing the hair color
Yes, I have. I have done so for many years.
I don't know what your reasons must have been. Anyways,   a primary reason is to cover gray or white hair, to change to a color regarded as more fashionable or desirable
Yes, that is why I do it now. I have some grays that I cover to blend with the rest of my hair. Do you color your hair?
Of course, I have some white hair as well, I usually do it at home with the help of my loving wife and sometimes through the services of a professional at a salon 
I prefer to use a professional. Do you have any advice about hair coloring?
Oh well, there is no big deal about doing this. About  $1.9 billion was spent for this alone  in 2011 in  USA