1 Although any individual may develop a case of pinworms, the infection occurs most frequently in school children between 5 to 10 years of age.  Pinworm infections occur in all socioeconomic groups; however, human-to-human spread is favored by close, crowded living conditions. Spread among family members is common.
Before they start collecting, stamp collectors try to identify the types of stamps. These will help them segregate and sort stamps according to their classification. On its basic concept, there are three main classifications of stamps â special, commemorative, and definitive.
Postage stamps have their own corresponding values. Old postage stamps, especially the rare stamps, are worth more than the newer stamps. The value of old postage stamps depends on the availability of similar stamp specimens. This means that the rarer your old postage stamp is, the more valuable it will be.