I am a stamp collector. the collecting of postage stamps and related objects.
How long have you been doing it?
I have been doing it since  It has been one of the world's most popular hobbies since the late nineteenth century 
Are your stamps valuable (in terms of monetary values)?
Yes it is because Stamp collecting proved to be an almost perfect hobby for me
Do you have a job doing something else for a living  other than collecting stamps since your hobby can be profitable?
As any hobby my hobby is is lengthy and always changing as interests and fashions change
Please tell me more about the types of stamps that you are collecting?
Mostly postage stamp that is a small piece of paper that is purchased and displayed on an item of mail 
Are those foreign or domestic stamps?