---
title: "Age"
id: "age"
project: "Zero-Gravity Exercise Routines Publication"
url: "https://hedronlabs.clickhelp.co/articles/zero-gravity-exercise-routines-publication/age"
updated: 2025-06-26T09:07:59Z
---

# Age

##  Age
 
Most stars are between 1 billion and 10 billion years old. Some stars may even be close to 13.8 billion years old—the observed [age of the universe](https://en.wikipedia.org/wiki/Age_of_the_universe). The oldest star yet discovered, [HD 140283](https://en.wikipedia.org/wiki/HD_140283), nicknamed Methuselah star, is an estimated 14.46 ± 0.8 billion years old. (Due to the uncertainty in the value, this age for the star does not conflict with the age of the universe, determined by the [Planck satellite](https://en.wikipedia.org/wiki/Planck_%28spacecraft%29) as 13.799 ± 0.021).

The more massive the star, the shorter its lifespan, primarily because massive stars have greater pressure on their cores, causing them to burn hydrogen more rapidly. The most massive stars last an average of a few million years, while stars of minimum mass (red dwarfs) burn their fuel very slowly and can last tens to hundreds of billions of years.

| Initial Mass ([M](https://en.wikipedia.org/wiki/Solar_mass)https://en.wikipedia.org/wiki/Solar_mass) | Main Sequence | Subgiant | First Red Giant | Core He Burning |
| --- | --- | --- | --- | --- |
| 1.0 | 9.33 | 2.57 | 0.76 | 0.13 |
| 1.6 | 2.28 | 0.03 | 0.12 | 0.13 |
| 2.0 | 1.20 | 0.01 | 0.02 | 0.28 |
| 5.0 | 0.10 | 0.0004 | 0.0003 | 0.02 |