[Estimating age from biochemical data of the lens (author's transl)]

The age of the rat can be estimated more accurately from the enzyme pattern of the lens of its eye than from the eye's wet weight. The two together result in a degree of accuracy of from - 13% to 15% for approximately two-thirds of all individual estimations. The observations cover 92% of the natural life expectancy of the rat. The principal enzyme used in estimating its age is aldolase; glucose-6-phosphate-dehydrogenase provides no relevant data.