boyishness

noun

1. (uncountable, usually)The quality of being boyish.

   “That slightly wide-eyed boyishness has given him a career playing ordinary people in extraordinary circumstances, whether that be everyone's favourite idiot-savant Forrest Gump (1994), a pilot who saves the day in Sully (2016), or the beleaguered Captain Miller of Saving Private Ryan (1998).”