I couldn't download the video (so forgive me if I am just repeating it), but, in general, it's a good idea to get new tires every 5 years or so, regardless of mileage or tread wear. Rubber can deteriorate, weaken, and dry-rot without visible signs on the outside of the tire, especially if not driven much.

 

Sunlight, ozone, and a number of environmental factors break down the rubber in your tires. "Weather checking", the fine cracks that appear in the sidewall near the tread are a good indicator of this deterioration.

My step-mother had an '84 Ciera that had 8K miles on the OEM Goodyears after 10 years. I never looked closely at those tires, and stupidly drove the car on a 400-mile trip. A few weeks later I had two of the tires blow out within less than five miles and a third tire had a serious tread separation when the tire service company replaced them. In the process of changing the tires, I ran on the mini-spare for a few miles too - blowing it out too after about 3 miles.

It's not just the mileage, it's the age. If your sidewalls are beginning to develop that "alligator skin" look, particularly in this summer's heat, get rid of them NOW!

 

i still have original bridgestones on my 2001 GS!!

im worried now...