I went to the dealer as I have a slow leak in a tire. Dealer said it was due to a previous plug leaking as well as the side of tire by the rim area. Offered to plug it up for $25 and "reseal" for another $25. Then I was advised that the tire was "old" (it's a 2009 Vibe GT) and had cracks and I should change it for that reason. As I use winter tires I have about 50,000 km on it and they are stock tires.
Is it usual to have to change stock tires so soon? Ever hear of cracks in a tire because the tire is 7 years old?