Kinematics of 237 Chromospherically Active Binaries ( CAB ) were studied .
The sample is heterogeneous with different orbits and physically different components from F to M spectral type main sequence stars to G and K giants and super giants .
The computed U , V , W space velocities indicate the sample is also heterogeneous in the velocity space .
That is , both kinematically younger and older systems exist among the non-evolved main sequence and the evolved binaries containing giants and sub giants .
The kinematically young ( 0.95 Gyr ) sub-sample ( N=95 ) , which is formed according to the kinematical criteria of moving groups , was compared to the rest ( N=142 ) of the sample ( 3.86 Gyr ) in order to investigate observational clues of the binary evolution .
Comparing the orbital period histograms between the younger and older sub-samples , evidences were found supporting Demircan ’ s ( 1999 ) finding that the CAB binaries lose mass ( and angular momentum ) and evolve towards shorter orbital periods .
The evidence of mass loss is noticeable on the histograms of the total mass ( M _ { h } + M _ { c } ) , which is compared between the younger ( available only N=53 systems ) and older sub-samples ( available only N=66 systems ) .
The orbital period decrease during binary evolution is found to be clearly indicated by the kinematical ages of 6.69 , 5.19 , and 3.02 Gyr which were found in the sub samples according to the period ranges of logP \leq 0.8 , 0.8 < logP \leq 1.7 , and 1.7 < logP \leq 3 among the binaries in the older sub sample .