Are stars with higher surface temperature older in age?

Answer 1

Some new stars are brighter than older stars, since it's at that period that the star begins to shrink. But as the star grows older, it will become a red giant and become larger and brighter. Finally, it is at it's brightest when it explodes in a supernova. For brown dwarfs, though, there is a violent first million years and then an uneventful and faint couple billion years. For big stars, there are eruptions at the surface very often, which gives them a very bright life of a couple million years.

Answer 2

As a matter of fact the surface temperature of hotter stars is usually because they are bigger then the lower temperature stars. These bigger stars although hotter are also burning their hydrogen fuel much faster then the cooler smaller stars. For instances the Sun is a very average yellow star in size and temperature. It is thought to be about 5 billion years old, and is expected to last another 5 billion years before it will change its structure significantly. Giant blue stars like Deneb may only last as a true star for only 60 million years, as it requires so much more fuel then the main sequence stars in order to keep it balanced between its energy to expand, and its gravity to compress.