Red supergiant stars are relatively old stars, typically in the range of a few million to a few billion years old. Here's a breakdown:

* Lifetimes: They have shorter lifetimes than our Sun. This is because they are much more massive and burn through their fuel much faster.

* Evolutionary Stage: They represent a late stage in the evolution of massive stars (8 to 50 times the mass of our Sun).

* Previous Stages: These stars were once main sequence stars (like our Sun) but have exhausted their hydrogen fuel and expanded significantly.

Key Points:

* Red supergiants are not the oldest stars in the universe. They are still relatively young compared to some of the oldest stars (which can be over 13 billion years old).

* The exact age of a red supergiant depends on its initial mass and composition.

Example: Betelgeuse, a famous red supergiant in the constellation Orion, is estimated to be around 8.5 million years old.

Let me know if you'd like to know more about red supergiants or stellar evolution!