Due to aging of the population and a possible rise in retirement age, the cognitive capacity of older people is gaining great importance. As evidenced by the increase in early retirement due to psychosomatic disease, many employees are not capable of working at a higher age. Decreasing cognitive abilities have usually been studied in subjects over 65 years based on the heterogeneous construct of mild cognitive impairment (MCI). This study investigates the prevalence of cognitive impairments in the age group from 50 to 59 years and their reflections in subjective vocational achievement and social medical evaluation. Having been assigned to inpatient rehabilitation due to decreasing work performance, these patients could be considered a risk group for developing MCI. A battery of standardized cognitive tests was conducted with patients at a psychosomatic hospital (Termine Test, CVLT, Block Design, TAP, and Tower of Hanoi). The MCI was defined by performance below the average age norm in at least two of five functional areas. Depression was assessed by the Beck Depression Inventory. Cognitive impairment was observed in 24% of participants. These patients also described vocational difficulties. Cognitive impairments of older employees could possibly be compensated for by specific training programs in order to maintain or rebuild their work capacity.