While I await Dan's reply, I offer a riddle for others to try:
My visiting friend looks quite like you,
Hands, eyes, and ears – of each he has two.
Tender age of 25, says with me he can now drink beer.
Take a moment to understand: he comes to visit from another land.
And similar though we may be, subtle differences there surely be.
Read on and learn more, my dear.
Another visit, time goes by
I age 3 years. He says “So have I,
And at 30 years I feel so young.”
I say “My friend, I think you're wrong,
30 years less 2 you have.”
He looks at me as if I'm mad.
I thought a minute, then it was clear.
I knew what had happened here.
25 and 3, you see,
is not the same to him as it is to me.
How many fingers upon each hand
Has this man from another land?