Definitions of ripe:

• adjective:   at the highest point of development especially in judgment or knowledge

  Example: "A ripe mind"

• adjective:   fully developed or matured and ready to be eaten or used

  Example: "Ripe peaches"

• adjective:   far along in time

  Example: "A ripe old age"

• adjective:   most suitable or right for a particular purpose

  Example: "The time is ripe for great sociological changes"