Abstract
We estimate here the age of one of the prototypes of the β Pic-like stars, Fomalhaut, based on the properties of its common proper motion companion Gl 879. By combining constraints derived from the lithium abundance, rotational velocity, H-R diagram position, and coronal activity we conclude that the age for Gl 879, and hence the age for Fomalhaut, is 200 ± 100 Myr. This age estimate agrees quite well with the completely independent age estimate derived directly from isochrone fitting to Fomalhaut's position in an H-R diagram, and thus confirms that circumstellar dust disks can persist in A stars for several hundred megayears.
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