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True; but most adults have a drivers' license instead. I don't think I know anyone who has a proof-of-age card.

'functionally equivalent' except where it's not.

There's a bunch of places where they've got some sort of ID requirement that only accepts either a licence or passport.

There's a really big assumption in this country that you must have a driver's license, and if you don't well then difficulties arise.

The best bit though, it will have a CRN on it. This CRN is the same as your drivers license. (at least in qld)

This means using a Drivers License / Proof of Age card is functionaly equivilant.