The age of the universe is obtained in a subset of Cardassian models by using WMAP data .
Cardassian expansion is a modification to the Friedmann equation that allows the universe to be flat , matter dominated , and accelerating , without a vacuum component .
Since this model changes the evolution of the universe , we should not a priori expect the Cardassian age to be the same as the WMAP Friedmann derived result of 13.7 \pm 0.2 Gyrs .
However , in the subset of Cardassian models we consider , we discover that the age of the universe varies from 13.4-13.8 Gyr over the range of parameter space we explore , a result close to that of the standard \Lambda 
Cold Dark Matter model .
The Hubble constant h , which may also vary in these models , likewise varies little from the Friedmann result .