  We investigate multicolour imaging data of a complete sample of low redshift
(z<0.2) QSO host galaxies. The sample was imaged in four optical (BVRi) and
three near-infrared bands (JHKs), and in addition spectroscopic data is
available for a majority of the objects.
  We extract host luminosities for all bands by means of two-dimensional
modeling of galaxy and nucleus. Optical and optical-to-NIR colours agree well
with the average colours of inactive early type galaxies. The six independent
colours are used to fit population synthesis models. We assess the presence of
young populations in the hosts for which evidence shows to be very weak.
