I like to look at stamps sometimes. Stamp collecting is a popular hobby.
I used to have a few stamps from my hobby as a child.  What's your oldest stamp?
I do not collect myself. I look at others stamps or stamps online. There is so many stamps to collect. 
Oh, what are your favorite stamps to look at?  Aren't there many different variations?
is the study of stamps. A philatelist may, but does not have to, collect stamps. It is not uncommon for the term "philatelist" to be used to mean a stamp collector. Many casual stamp collectors accumulate stamps for sheer enjoyment and relaxation without worrying about the tiny details. The creation of a large or comprehensive collection, however, generally requires some philatelic knowledge and will usually contain areas of philatelic studies.
Postage stamps are often collected for their historical value and geographical aspects and also for the many subjects
demand, they often contain more variation than is typically found in stamps that have a single print run. Switching printing methods and experimenting with phosphors is a common source of variation in modern stamps, while differences in watermarks and perforation are also prevalent, especially in older stamps. Many philatelists study these differences as part of their hobby and try to collect all the varieties of each stamp. Some varieties are particularly rare and can be more valuable than others of the same stamp that may look the same to the casual observer. One