Age and the rigidities.
D000064:Acclimatization; D000222:Adaptation, Physiological; D000223:Adaptation, Psychological; D000368:Aged; D000369:Aged, 80 and over; D005853:Geriatrics / Q000523:psychology*; D001523:Mental Disorders; D009127:Muscle Rigidity
ADAPTATION, PSYCHOLOGICAL/in old age; GERIATRICS/psychology