Two, actually.
I am 14. You are 15. One year.
I was born in '92, you were born in '94, two years.
February, what's your month. If I am 14 and your 15, that's 1 year difference.
15-14=1
15-14=1
October. It's still two years by my standard.
THen you have a stupid standard.
I see said the blind man.
Ba-doom, crash!