# Lifespan

- [Spent Output Age Bands (SOAB)](/guides-and-tutorials/metric-guides/lifespan/spent-output-age-bands-soab.md): Spent Output Age Bands (SOAB) is a metric that bundles spent coins into categories depending on their age and presents them in colour bands as a proportion of total coins moved.
- [Average Spent Output Lifespan (ASOL)](/guides-and-tutorials/metric-guides/lifespan/average-spent-output-lifespan-asol.md): ASOL (Average Spent Output Lifespan) is the average age (in days) of all spent transaction outputs.
- [Median Spent Output Lifespan (MSOL)](/guides-and-tutorials/metric-guides/lifespan/median-spent-output-lifespan-msol.md): MSOL (Median Spent Output Lifespan) is the median age (in days) of all spent transaction outputs.