Not sure. Just a different perspective because I've seen all kinds of theories about quarter-life and mid-life crises.

I think there is a time in a lot of people's lives where they hit some situation that causes them to question who they are, might raise fear/depression/anxiety in them, or causes some emotional or mental breakdown. An observation I had during my separation and divorce was there's often a huge loss or incident that reminds them of some past abuse, traumatic incident, or hurtful situation in their lives and they may act out or behave strangely. Even the person in "crisis" can't pinpoint it for you...it's a vague, nagging, confusing time for them.

Good question/food for thought though.