The metallicity is listed as -0.55 [1].

Metallicity is on a logarithmic scale [2], so that's about 58% as many heavy elements as our solar system.

That seems freakishly high for a star that old. That might be the only reason it has planets at all. There aren't any heavy elements to make planets with in most stars that age.

[1] http://exoplanet.eu/catalog/kepler-444_c/ [2] http://en.wikipedia.org/wiki/Metallicity