Origin: French suffix -age
Underage has 4 different meanings across 1 category:
A deficit or shortfall in funds, inventory, or capacity.
"The store manager realized they were underage on coffee supplies after the morning rush left them unable to serve any more customers."
dependent by virtue of youth
"The club refused to let our underage members enter because they are too young to be responsible for themselves."
Below the legal age for some activity, such as drinking or having sex.
"The bouncer refused entry to the club because he was underage and could not legally purchase alcohol."