A secret poker game you can play on the subway

So you ask their age or what?

when is a women a women? and when does she become 'elderly' ?

you also cannot see if a teenager is 19 or 20.

A more legit question would be "in a deck of cards there are 4 of each". Now, I don't play poker, but assuming that is 1 deck, it's 4 aces. If it's 2 decks it's 8 aces.

What happens if you get on 'that time of the day' and/or 'that specific station' and there are a bunch of old folks and you end up with "all cards are aces?". Someone is cheating!!! :)