  Using a sample of 68 planet-hosting stars I carry out a comparison of
isochrone fitting and gyrochronology to investigate whether tidal interactions
between the stars and their planets are leading to underestimated ages using
the latter method. I find a slight tendency for isochrones to produce older age
estimates but find no correlation with tidal time-scale, although for some
individual systems the effect of tides might be leading to more rapid rotation
than expected from the stars' isochronal age, and therefore an underestimated
gyrochronology age. By comparing to planetary systems in stellar clusters, I
also find that in some cases isochrone fitting can overestimate the age of the
star. The evidence for any bias on a sample-wide level is inconclusive.
  I also consider the subset of my sample for which the sky-projected alignment
angle between the stellar rotation axis and the planet's orbital axis has been
measured, finding similar patterns to those identified in the full sample.
However, small sample sizes for both the misaligned and aligned systems prevent
strong conclusions from being drawn.
