20 years

a fickle age, changing from one experience, one opinion to the next. not yet seriously thinking about the future. falling madly in love at first sight, playing hide and seek with emotions. and things pop out of the mind as fast as they hop in.
At twenty, you're allowed, you're supposed to play around with the games of love. Worries will there be waiting enough in the future, so don't bother them now.

Is this reason enough for our unreasonable doing?
Or is it a plain but welcome excuse to justify what I can't justify otherwise?