The level of CoQ 10 decrease with age

Age-related Changes in the Lipid Compositions of Rat and Human Tissues

In human pancreas and adrenal the ubiquinone content was highest at one year of age, whereas in other organs the corresponding peak value was at 20 years of age, and was followed by a continuous decrease upon further aging. A similar pattern was observed in the rats, with the highest concentration of ubiquinone being observed at 30 days of age.

Source: LIPIDS, Vol. 24, No. 7 (1989)