* Alpha Centauri A: This star is very similar to our Sun in size and mass, with a slightly hotter temperature and a slightly longer lifespan.

* Alpha Centauri B: This star is smaller and cooler than our Sun, but still similar in size and mass.

* Proxima Centauri: This is a red dwarf star, much smaller and cooler than the other two. It's the closest star to our Sun.

The ages of these stars are difficult to determine precisely, but estimates place them all at around 5 to 6 billion years old. This is roughly the same age as our Sun, which is about 4.6 billion years old.

So, while it's difficult to say definitively how old Alpha Centauri is compared to the Sun, they are likely very similar in age.