  Several recent studies of Solar twins in the Solar neighbourhood have shown a
tight correlation between various elemental abundances and age, in particular
[Y/Mg]. If this relation is real and valid for other types of stars as well as
elsewhere in the Galaxy it would provide a very powerful tool to derive ages of
stars without the need to resort to determining their masses (evolutionary
stage) very precisely. The method would also likely work if the stellar
parameters have relatively large errors. The studies presented in the recent
literature span a narrow range of [Fe/H]. By studying a larger sample of Solar
neighbourhood dwarfs with a much larger range in [Fe/H], we find that the
relation between [Y/Mg] and age depends on the [Fe/H] of the stars. Hence, it
appears that the [Y/Mg] - age relation is unique to Solar analogues.
