Abstract
It is explained how the Hubble age of the Universe may be determined from observation of gravitational lens images. A simple derivation of the relevant expressions is given, based on the wavefront method. The theory is applied to observations of the quasar Q 0957+561 A, B. Assuming a simple model of this system, and using the most probable values of the observed quantities, the theory leads to an estimated Hubble age of about 17*109 years, corresponding to a Hubble parameter H0 approximately=57 km s-1 Mpc-1, which is in reasonable agreement with the results of conventional methods. If the Universe has a density close to the critical mass density, this implies that the age of the Universe is about 11*109 years.
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