If the 5 guys are all current or former NBA players then yes, they would trash any NAIA team any day (not NCAA, that woiuld be our tier II). And yes they would put up those numbers because thier competition is crap. They would likely be competative against half of the NCAA teams too. And those 37 Y/O players are always going to be good. You don't stick around until that age if you suck. Always remember that the worst NBA team is still better than the NCAA champs. So, those older players, while having lost a step, are still vastly better in skill then your typical lower division team can put up.
I took a look in the NBBA division and while their are a few 37+ y/o players, most are either minute soakers or reserves. Only a about three looked to be starters.
BTW, there are 10 players in the NBA right now 36 years old or older including Lebron James and Chris Paul.