Don't drive on old tires

Attachment 17150
This tire is 6 years, 9 months old since manufacture. Less than 40,000 miles on the tire. Pirelli Cinturato P7 All Season run flat tires. I've always kept it inflated to the proper tire pressure. Upon tire removal, I saw this. Conclusion: I will replace tires before they get too old.

Some tyres if they will last 40,000 miles! I reckon to get 15,000 from fronts and 30,000 from rears.