[thombat]

However current theories of stellar evolution place the extinction of life on Earth in the range on hundreds of millions of years, due to the increase of its luminosity. For example here's a description of a better climate model [1] extending the time until the surface temperature reaches 70 degrees Celsius to one billion years, whereupon feedback of the water content of the atmosphere results in boiling away all liquid water.

So while the sun may be nowhere near the end of its life, the time of Earth lying in its "Goldilocks zone" is much shorter.

[1] https://www.sciencedaily.com/releases/2013/12/131216142310.h...