When two things live or happen during the same period of time, they are coeval. If you annotate an old poem, the annotations and the text of the poem are not coeval.

The word coeval comes from the Latin co- "jointly" or "in common" and aevum "age." The beginning of Major League Baseball is coeval with the invention of the telephone. People can be coeval, though more often you'll hear contemporary used to describe people who are about the same age. You and your contemporaries probably view the world a lot differently than your grandparents' generation.

Definitions of coeval
  1. adjective
    of the same period
    synonyms: coetaneous, contemporaneous
    synchronal, synchronic, synchronous
    occurring or existing at the same time or having the same period or phase
  2. noun
    a person of nearly the same age as another
    synonyms: contemporary
    see moresee less
    type of:
    compeer, equal, match, peer
    a person who is of equal standing with another in a group
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