The fact that many happy and well-adjusted adults were once rebellious and unhappy as adolescents is most relevant to the issue of

Change

Explanation:

The fact growing up is inevitable many adults seem happy and free whenever they make and take decisions without interference from mostly Parents that use to supervise their where about and life changes during their adolescent stage.

Most Adult are usually fired up because of life decisions like Settling down, Bills( House rent, Medical bills, Taxes etc) the fact that they are free and independent financially.

answer; rhythm test;