I was looking on Amazon for 15th birthday cards and up popped a whole load of adverts for tshirts saying 'made in 1996' 'born in 1997' ....

is it me? have I lost a few years somewhere? I thought if you were going to be 15 this year, surely you were born in 2002 ( unless it was a leap year and you were born on 29th Feb?!!! )