The question scientists are asking is whether the process can be stopped or whether the process is the result of subtle pathological process and represents disease, rather than normative developmental stage. Nutrition, physical exercise as well as chronic stress affect hormonal levels. Chronic stresses evoke prolonged distress which can influence cardiovascular, immune and endocrine function, changes in which can enhance a variety of health threats. The sad thing in our society is that most Americans do not exercise. Health is an important concept, with very little chance of instant replay.
Chronological age is a given.
Biological age is something we all may do something about. Take charge of your health.