  The quality of the MAKET-ANI detector installation in view of the uniformity
of the registration efficiency is demonstrated. Based on a data sample
collected by the MAKET-ANI array in the period of June 1997 - March 1999, the
dependencies of the age parameter on the zenith angle and the EAS size
(10^5-10^7) are studied. The variation of the age parameter with the shower
size can be approximately related to the elongation rate.
