There are lots of potential metaphors that can be drawn. Just like life you need to use what you get and hope you can have some luck and can fully utilize your "free" space and become a "winner". I think that everyone has that "free" space and just like many religions indicate one has only to look to the "center" to find it.
Maybe I can imagine that the numbers are the special years, (or days of the year) that were/are auspicious in life. Maybe it is just the idea of an innocent, low tech game that makes us nostagic for a simplier time. Maybe its just a fun background to play with. There are an infinite number of BINGO markers you could use, (roses, bugs, diamonds...). The numbers could mean anything that makes sense to you. A locker combination? Your lucky or unlucky numbers? The day of your birth or a loved one's death? Something silly or nothing at all.
I got a vintage looking BINGO card in a K & Company emphemera pack http://eksuccessbrands.com/kandcompany/Products/Handmade_Ephemera_Pack__30-387591.htm
So far I've made 5 cards, here's my latest. See what you think and if you can find some inspiration.