Physically

New Born - 12 weeks = Pup
12 weeks - 1 1/2 years = Teenager
1 1/2 - 3 years = Young Adult
3 - 6 years = Adult
6 - 11 years = Elder
Approximately 11 - 15 years = Death

This chart explains the growth rate of a wolf physically, becoming sexually mature (truly an adult) at about two years of age. 

"Mentally"

New Born - 1 1/2 years= Pup
1 1/2 years - 2 1/2 years = Teenager
3 years - 5 years = Young Adult
5 - 8 1/2 years = Adult
8 1/2 - 11 years = Elder
Approximately 11 - 15 years = Death

This chart explains the growth rate of a wolf "mentally", for roleplaying purposes. According to the 7-year theory, a 1 1/2 year old wolf would be the equivalent of a ten year old human being. Thus, a wolf in its first to second year would be like a teenager mentally.

10 - 13 days: the eyes open3 weeks: the milk teeth appear, they start to explore the den4 - 5 weeks: short trips outside the den, begin to eat meat6 weeks: moving up to a mile from the den (with adult wolf)6 - 8 weeks: pups are weaned, traveling to rendezvous site.12 weeks: begin to travel with the pack on hunts (with adult wolves)15 - 28 weeks: milk teeth are replaced7 - 8 months: begin to hunt with the pack