How old is the star altair?

Answer 1

Determining the actual age is very difficult, if not impossible.

However, we do know that Altair has a spectral type of A7V so we know it is still on the main sequence.

We also know it's mass and luminosity so it is possible to deduce the length of time the star will live for: 1.6 billion years.

As the star is relatively close to us, it is possible it was created around the same time as our Sun, so it could be about half way through it's life.

So, at a guess, Altair is 800 million years old.

Answer 2

Altair is estimated to be around 1.2 billion years old.