I forgot to finish that thought. If I were to make a list of them, they'd be likely to fall along that same line. But that would remain true all through my life: the listed events would just change. Close to the time my kids were born, I'd have listed their births individually. Decades from now, they might get compressed into "my kids were born". At age 18, high school graduation loomed as a critically important thing; from my perspective at age 41, it's just another marker of normal development, like puberty.