The word longevity, or having a long individual life, comes from the Latin word longaevitäs (longus: long and aevum: age). Longevity refers to the average number of years that a single person is expected to live under ideal conditions.
Generations are not defined by formal process. Rather, they are categorized by demographers, the media, popular culture, market researchers, and by members of the generation themselves.
In school, economics was often an orphan that was largely ignored, rarely enjoyed, and almost instantly forgotten (civics always seemed condemned to a similar fate).
