Who is older Katniss or Peeta?

Who is older Katniss or Peeta? Peeta is the same age as Katniss, making him 16 years old in The Hunger Games and 17-18 in Catching Fire and Mockingjay.

Peeta is the same age as Katniss, making him 16 years old in The Hunger Games and 17-18 in Catching Fire and Mockingjay.