Scientists behind the Planck Mission believe the universe to be 13.82 billion years old. But given space was more dense during the early baryonic matter phase (roughly 47,000 years after Big Bang) and time slows down in high gravity, is that 13.82 billion years at our gravitational density, or 13.82 billion years of cosmic time? There would be a difference due to time dilation within high gravity - a measured second back then would be longer if observed from a present day gravitational perspective (not that it could).
Note that the above image is pre-Planck.
Just something to ponder while you're cutting the grass today.