Ageing may be perceived by oneself differently from other people. Keller et al. These affect perceptions, beliefs and communication between older and younger people. Ageing is a highly individual experience. Chronological age may differ from a person's functional age.
Age related changes occur at different rates for different persons.
For instance, intelligence and memory change in a complex manner rather than generalized declines. No sharp differences occur either physically or psychologically when a person reaches 65 years of age. Absolutely no clinical evidence exists for selecting this chronological age as a retirement age. Some impairments and deficiencies do occur as a person ages, but the person often finds ways of adjusting and compensating. Most older adults are not in poor health.