His age is not specified.
If you mean Mario kart wii i think it is BLUE FALCON!!! -BabyBobser-
No, he's not. He's just a regular character that's not bad in Mario Kart Wii.
You can't unlock him. You can only play as "King Boo" on "Mario Kart Wii".
You can't get R.O.B or Petey Piranha on Mario Kart Wii, but you get Toadette by "Playing on all 32 courses in Time Trials mode or winning 1,000 Wi-Fi online matches." You don't have to unlock the Koopa Troopa. He's already there!
Baby Mario, Baby Luigi, Baby Peach, Baby Daisy, Toad, Toadette, Koopa Troopa, Dry Bones.
You can't.
Oh, dude, Koopa Troopa isn't inherently "bad." They're just misunderstood turtles trying to make a living in the Mushroom Kingdom. Sure, they might throw some shells around, but who hasn't had a bad day at work? Give Koopa Troopa a break, man. They're just trying to survive in a world full of plumbers and princesses.
Dead Koopa Troopa, otherwise known as Dry Bowser, can be unlocked by playing 4,350 races, which I must admit is a lot, or by obtaining at least one star rank on all of the 150cc Wii Grand Prix. To get a star you must be in first for about all of the race. The Wii Grand Prix is the Mushroom, Flower, Star, and Special Cup in 150cc.
26 characters: Baby Mario Baby Luigi Baby Peach Baby Daisy Toad Toadette Koopa Troopa Dry Bones Mario Luigi Peach Daisy Yoshi Birdo Diddy Kong Bowser Jr Wario Waluigi Donkey Kong Bowser King Boo Rosalina Funky Kong Dry Bowser Mii Outfit A Mii Outfit B
Baby Daisy Baby Peach Baby Luigi Baby Mario Koopa Troopa Toad Toadette Dry Bones Mario Luigi Daisy Peach Birdo Yoshi Boo Bowser Bowser Jr. Dry Bowser Rosalina Donkey Kong Diddy Kong Funky Kong Wario Waluigi
Super Mario Kart is not for Wii.
No, there is no Mario Kart Wii 2, but there will be a Mario Kart on the 3DS by the end of this year, and it is extremely likely that there will be a Mario Kart on the Wii U.