Middle adulthood, also known as midlife, refers to the period of the lifespan between young adulthood and old age. This period lasts from 20 to 40 years depending on how these stages, ages, and tasks are culturally defined. The most common definition by chronological age for middle adulthood is from 40 to 65, but there can be a range of up to 10 years (ages 30-75) on either side of these parameters. Therefore, middle adulthood can be defined as the time of ages about 40+ to about 60+, depending also on sexes.