Wiress is about 35-45 years old, Beetee is some years older.
about 12+
Foxface was 15 when she went into the Hunger Games.
Katniss Everdeen was 16. In Mockingjay she was 17.
13, but plays 12 in the hunger games
she is 16-18
Beetee's age is unknown, but Wiress is in her early 50's
It doesn't say a specific age, but you are to assume they are middle aged. Beetee is 40-ish and Wiress is 30-ish.
In Catching Fire, every tribute from the 75th Quarter Quell (besides Katniss, Peeta, and Maggs) are what you'd consider 'old winners,' or what The Hunger Games might call previous/past victors. POPULAR past victors include Finnick, Haymitch, Johanna, Wiress, Beetee, Brutus, and Enobaria.
Glimmer was 17 in The Hunger Games.
You have to be through the ages of twelve and eighteen.
Sixteen.
about 12+
According to The Hunger Games wiki, he is around in his mid 30's.
Foxface was 15 when she went into the Hunger Games.
Prim was 12-years-old in The Hunger Games and she was 13 in Catching Fire and Mockingjay.
By the timeline of the second book Catching Fire, the Hunger Games have been going on for 75 years
Thresh was 18 when he went into the 74th Hunger Games