Middle age is the period of age beyond young adult

Young adult (psychology)

A young adult, according to Erik Erikson's stages of human development, is generally a person between the age of 20 - 40, whereas an adolescent is a person between the age of 13 - 19, although definitions and opinions vary. The young adult stage in human development precedes middle adulthood. A...

hood but before the onset of old age

Old age

Old age consists of ages nearing or surpassing the average life span of human beings, and thus the end of the human life cycle...

. Various attempts have been made to define this age, which is around the third quarter of the average life span of human beings.

According to Collins Dictionary, this is "... usually considered to occur approximately between the ages of 40 and 60".

The Oxford English Dictionary gives a similar definition but with a later start point "...