Middle age

thumb|right|Тhe changes in ovarian hormones throughout the human lifespan. During childhood, hormone levels are low. During puberty, estrogen begins to fluctuate, followed by progesterone when you first begin ovulating. After 6-12 years the menstrual cycle normalizes into a rhythm during the menstrual years, barring any reproductive health issues or pregnancy and breastfeeding, which pauses the cycling. Perimenopause, similar to puberty, has high fluctuations of estrogen as progesterone slowly begins to decline. Eventually, a person stops ovulating, reaches menopause, and hormones return to ch

thumb| The Favorite – Grandfather and Grandson, by Georgios Jakobides (1890)

thumb|Jennifer Coolidge, whose character in American Pie helped popularize the term "MILF"

period of age beyond young adulthood but before the onset of old age

transition of identity and self-confidence

rare condition in older men, characterized by measurably low testosterone levels

expression about parental feeling of grief and loneliness

biology theory on the evolutionary origin of menopause

thumb|Grown man with expensive bicycle and tight-fitting clothes