The birthday analogy is a good one, I'll have to keep that in mind. Your actual "birthday" being the points between year elements, your "age" as the offset from birth.
As to the point about floor numbering, the situation can be a little confusing in Canada. Some buildings label in the US style, labeling stories [1st, 2nd, 3rd] while others label in the UK style as [Ground, 1st, 2nd]. We also often mix them and you'll see [Ground, 2nd, 3rd], with ground sometimes replaced by main, or lobby.
As to the point about floor numbering, the situation can be a little confusing in Canada. Some buildings label in the US style, labeling stories [1st, 2nd, 3rd] while others label in the UK style as [Ground, 1st, 2nd]. We also often mix them and you'll see [Ground, 2nd, 3rd], with ground sometimes replaced by main, or lobby.