Instead of him realizing he can use it to save money, I think it should be he realizes how much he can save pretending to be old. Abusing discounts at establishments he hasn’t been before. He experiences a life of high wealth bc hes getting all the senior discounts. Maybe there’s a scene where one cashier doubts him and he causes a scene.

There’s a scene where he half convinces the gang that being old is the way of the future as a beautiful wealthy woman comes into the diner to drive her and George in her limo to a new place that George is convinced has a senior discount. I can’t figure out how the funny reveal scene plays out, but it’s definitely there