25 is an acknowledged point where physical Brain development generally ceases and hormone production levels out.
The 25 factor has long been used by Government armed forces recruiting as the age where it becomes difficult to repeatedly stress troops, because reason is becoming a dominant factor in thought processes, as opposed to unreasoned responses to threats governed by endocrine system responses.
It isn't arbitrary and it is backed by Human development luminaries like Lord Winston.
However there are social factors, personality, and peer pressure involved in activities like motorcycling. Millions of years of instinctual responses can't be overridden by 150 years of technological progress either, so of course people over 25 can behave "badly". I never suggested otherwise, just that under 25 year olds KNOW they are immortal because their brain tells them so. Women are less afflicted by this syndrome, but by no means immune.
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