I'm struggling at the end to get out of the valley of hectoring youth, journalistic middle age, imposture, moneymaking, public relations, bad writing, mental confusion.

Our fMRI scanning reveals that middle age represents the transition between the patterns observed in youth to that found in old age. The see-saw imbalance in the two frontal lobe areas is not as significant as in older adults, but the functional changes are detectable by middle age.

There are three periods in life: youth, middle age and "how well you look

Middle age is youth without levity, and age without decay.

Whoever, in middle age, attempts to realize the wishes and hopes of his early youth, invariably deceives himself. Each ten years of a man's life has its own fortunes, its own hopes, its own desires.

The three ages of man: youth, middle age and 'my word you do look well'.