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Reference.org
Stellar age estimation
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<p>Various methods and tools are involved in stellar age estimation, an attempt to identify within reasonable degrees of confidence what the age of a star is. These methods include stellar <a href="/facts/Stellar_evolution/Qa4vAGmn">evolutionary models</a>, membership in a given <a href="/facts/Star_cluster/Crs7Y6me">star cluster</a> or <a href="/facts/Star_system/1vX99BMV">system</a>, fitting the star with the standard <a href="/facts/Stellar_classification/dYrIuK9H">spectral and luminosity classification system</a>, and the presence of a <a href="/facts/Protoplanetary_disk/FtfSbP61">protoplanetary disk</a>, among others. Nearly all of the methods of determining age require knowledge of the mass of the star, which can be known through various methods. No individual method can provide accurate results for all types of stars. </p>