countless? how about for a chinese orphan born during the tiananmen square massacre? I could count those opportunities on one hand
Chance also favors those who expose themselves to it. It is very easy to sit on ones ass for a decade, with a narrow and constant social circle, without trying anything new.
Misfavors too. We have limited time and mental resources to manage social circles. Someone falls off the list.
Ann's whether a new circle will be beneficial is not obvious.
Some people never got a chance to become prepared.