Nutrition is a basic human necessity as well as a requirement for a long and healthy existence. A healthy diet is necessary for growth, development, and active living beginning at a young age. Nutrition is the science that deals with all of the different components that make up food, as well as how to get sufficient nutrition. The typical nutritional requirements of groups of people are set and are based on measurable variables including age, sex, height, weight, level of activity, and growth rate. Healthy lifestyle choices, such as eating a well-balanced diet and getting regular exercise, help to reduce the risk of noncommunicable diseases and improve physical and mental capacity as people get older. Between 2015 and 2050, the share of the world's population aged 60 and up is expected to nearly double, from 12 to 22 percent. To unravel the mechanisms responsible for the positive/negative impacts and to discover diet components that promote the quality of life in old age and contribute to the prevention of late-life disabilities, a deeper knowledge of the interplay between nutrition and ageing is required.