The character Tinker Bell lives in Neverland. While she has undergone some changes over time, Tinker Bell, has always been a popular Disney character from Neverland.
Neverland is a imaginary place created by author J.M. Barrie who also created Peter Pan. Tinker Bell lives in Neverland with Peter Pan, Captain Hook, the Lost Boys and princess Tiger Lily.
While not all inhabitants of Neverland stay young, it is known as a place for people who refuse to grow up. It is a place of eternal childhood and escapism where inhabitants can live forever. This is why Tinker Bell and her friends from Neverland do not age.