How old is sly cooper in sly 3

He's actually 23, believe it or not. I believe it! Why wouldn't anyone? I've just been guessing this whole time that he was 21. Wait! Would he be 21 in Sly Cooper and the Thievius Raccoonus? You know, the first game? He is 18 in the first sly game here is a list. Sly 1- 18 Sly 2-20 Sly 3-23 Sly 4-24 sly 5- 26 sly 6- 28