According to the Kirby Wiki, Kirby's age is not exactly known. He is referred to as a "small child" and has very childlike qualities. In the anime he was put in suspended animation for a very long time at birth, and was supposed to be sent to the Start Warrior academy. When he crash lands on Pop Star he is unable to talk nor fight, and knows absolutely nothing. Even though the residents of Dreamland do not know his age, he celebrates his 1st birthday in "Episode 51: Kirby Takes the Cake" so he is presumed to be at least 1 year old.
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I guess he could be old as Kirby
meta knight is a Kirby not the Kirby that saves the world, hes just a Kirby
Kirby lives in a place called Dreamland.
Kirby can talk, but he is basically a baby, since his race takes around 200 years to reach what would be around 18-20 years old to them. He was awoken by monsters, summoned by Dedede.
Nobody knows. People say he is named after John Kirby, who was a lawyer who helped Donkey Kong stay in Nintendo, and the KIRBY vacuum cleaners. Because Kirby can suck. Kirby used to be called "Popopo" don't ask me how THAT got started...