In the book Mockingjay, the third book in The Hunger Games series, Katniss Everdeen was seventeen (17) years old. We get this evidence from "My name is Katniss Everdeen. I am SEVENTEEN years old. My home is
District 12, etc.
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Jennifer Lawrence is 20, in Mockingjay Katniss is 17, in the first book she's 15, and the third she's 16.
When her father died in a mine explosion, her mother was so devastated that she zoned out, leaving an 11-year-old Katniss on her own to fend for herself and her family
Katniss Everdeen's favorite food is the Capitol's lamb stew with dried plumbs.
Katniss missed her old life because she wasn't so "popular" and she didn't have to be a star-crossed lover with Peeta before. She preferred her quiet life with her mother, sister and Gale. And she could hunt with Gale, she still could, but there was no point to.
Katniss Everdeen's father died when she was 11 and her sister Primrose was 7. He died in a coal mining accident where there was an explosion underground and he couldn't get help. This left Katniss, Primrose and her Mother alone to fend for themselves. Soon after Katniss started hunting illegally with gale to get food for the family and to sell on to other people to get money as her mother wasn't making any. When Katniss was saying her final (or what she thought would be final) goodbye to her Mother and Prim, she said for her mother to stay and look after Prim and not to run away and leave her as it would be tough living by herself without her. Hope this Helps you.
Prim was 12-years-old in The Hunger Games and she was 13 in Catching Fire and Mockingjay.