Tires: tyre life, tyre life, time span

Question
I bought my car in 1998  it was ex factory  I used it lightly for 43000 km .   the tires look in very good condition  when I  inspect them  they are not worn and there are no cracks or bulges &when  washed they look brand new.  I heard that tires have a limited life  even if they were used sparingly .Please tell me if I have to change my tires after 43000 km and not a single tire was punctured during that time

Answer
Sami,

The current thinking is that there is a limited time span of usefulness to the rubber in tires regardless of whether the tire was used or not.  The limits have been expressed between 6 and 10 years.

So based on your information, I would say it is time for you to replace your tires.