age out

verb

Etymology: The phrasal verb preposition out is analogous to run out. Usage was likely spread by the Boy Scouts of America, where it is largely used in the first sense to mean turning eighteen and becoming ineligible for the youth program.

1. To become too old for an activity, program or institution; to become too mature for a behavior.

   “When foster kids age out, it is important that the state provides them with support.”

   “I am aging out of queenship indeed, when even the beggars refuse my bidding.”

2. To die or retire.

   “The party's chances in the coming election looked grim as a large portion of their voters were going to age out.”