When added together how long is a normal star and a white dwarf lifespan?

Question

If whute dwarfs are billions of years old and befroe they were white dwarfs they were normal stars some of them must be older than anything in the universe-how old are they?

Answer 1

The oldest white dwarfs are estimated to be 12 to 13 billion years old, and have cooled their way down to class M (red).

Answer 2

Nothing can possibly be older than the universe itself, which is 13.7 billion years old.

Stars of different masses have different lifetimes. The largest mass star that will become a white dwarf is under 8 times the mass of the Sun. Those stars have a relatively short lifetime (the more massive the star, the shorter its lifetime) of about 100,000,000 years. Stars like our Sun have a lifetime of 10 billion years. Less massive stars have even longer lifetimes.

White dwarfs last a very long time, if they are isolated. The only change they undergo is they cool down, eventually becoming a black dwarf. I forget how long that takes, but it's longer than the current age of the universe.

Answer 3

White dwarfs can last "forever", although they get cooler and cooler and some people then call them "Black dwarfs". Normal stars like the Sun typically stay on the Main Sequence for several billion years.

Answer 4

kris' answer is perfect!!! although i think the universe is closer to 15 billion years old. put it to you this way most "normal" stars live about ten billion years. however not all white dwarfs were normal stars some of them were born white dwarfs...hope this helps!!!!!!!!