What is the age difference between Temari Kankurou and Gaara?

Let me clear things up. Temari is the oldest of the three sand siblings (15-16 in Naruto, 18-19 in Shippuden), Kankuro is the middle child (14-15 in Naruto, 17-18 in Shippuden), and Gaara is the youngest of the three (12-13 in Naruto, 15-16 in Shippuden). I found this out on www.naruto.wikia.com/wiki then searched Gaara, Temari, and Kankuro.