Comment by interestica

Is the idiom "behind the 8 ball" common in the USA? I'm not sure I'd heard it before Biden used it to refer to the disadvantages black people face when trying to get a loan, etc. I'm not sure billiards/pool is popular enough (especially for young people) for someone to quickly deduce the meaning. I found it to be a strange term and wondered if it was just a dated term. Would anyone in K-12 understand it?