# Infinitely repeated games and real-world situations?

I do understand the gist of what infinitely repeated games are in that T=$\infty$ ; that is the stage game is played each period for an infinite number of periods.

In his book "Strategy", Watson makes the following claim:

Although such a game may not seem realistic at first (people do not live forever), infinitely repeated games are useful for modeling some real-world situations.

With reference to the part in bold, could you elaborate?

Thanks.

Just try to say what is this $T$ for the life of a human? 150 years? Even if you are 150 years old there is a (probably small) chance that you will survive another year. And the next year? There is also another chance to live another year, and so on.