There are a number of ways of measuring the age of the observable universe. One of the most used, but often revised is the use of the Hubble Constant to determine the actual expansion of the universe. The Hubble Constant is depicted as 1/Ho and currently estimated to be 72 km/sec/Megaparsec or between 12 and 14 billion years. Another way of saying it is it means is that every million years, all the distances in the universe stretch by 0.007%. The expansion of the universe is observed by the Wilkinson Microwave Anistropy Probe (WMAP). WMAP creates a picture of the microwave radiation using temperature difference measured from opposite directions (anisotropy). The radiation (observed by the snow on an untuned TV set) is believed to have originated about 400,000 years after the creation of the universe. Other determinations are made by observing white dwarf stars and other methods. While they are not in agreement, they do approximate the 12 to 14 billion (Bya) years of age.
So, long winded but neccessary way of saying the age is not dependent on your description.
As a matter of fact, though, within a few billionths of trillionths of a second following the creation event, the universe went through inflation and enlarged from the size of a beachball to well over the size of our galaxy, clearly exceeding, by magnitudes of order the speed of light... the speed continues somewhat abated, but is accelerating. The bottom line is that different pairs of galaxies are moving at different speeds with respect to each other; the further the galaxies are, the faster they move apart.