midlife

adj

1. (not-comparable)Occurring in the middle point of one's life, usually considered about 45.

noun

1. The middle period of one's life.

   “Twins from all the patterns of twinship experienced this emotional disaster as young adults or in their midlives.”

   “Now we were writing, talking, sharing bits of our lives again, glad that both of us were able to talk about our midlives (which we realized could very well have been our late lives).”