He wasn't given a specific age. He was described as being Middle-Aged.
I'm not sure if he was still alive in the epilogue, but he was alive at the end of mockingjay.
Wiress is about 35-45 years old, Beetee is some years older.
Peeta, Gale, Katniss, Haymitch, Plutarch, Annie, Delly, Gale's family, Mrs. Everdeen, Sae, Thom, Pollux Cressida, Dr. Aurelius, Beetee, Paylor, Effie, Johanna Mason
Beetee's age is unknown, but Wiress is in her early 50's
16, in catching fire and mockingjay is she 17.
He is male.
They are casting in June of 2012. When I was looking at the Catching Fire movie timeline I didn't see anything about them casting a Beetee. If they don't I believe the fans will be disappointed, because he has a pretty big part in both Catching Fire and Mockingjay.
Katniss Everdeen was 16. In Mockingjay she was 17.
In the epilogue she is 32 years old, in the book she is around 17 years old.
There are no games in Mockingjay...
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.
No mockingjay was the final book