Three situations constitute natural defining moments and deserve our attention:
Transitions seem so natural that they are almost always marked with some sort of “coming of age” rituals: weddings, promotions, the first day of school and the end of projects, etc.
Milestones. Birthdays are the most obvious milestones, (18th, the 21st, the 30th, 40th, 50th, 60th, and the 100th) , retirement, and unheralded achievements (such as, say, a salesman’s 10 millionth dollar of revenue).
Pits are the opposite of peaks, i.e., negative defining moments, moments of hardship or pain, or anxiety.