The Human Images.

It appears when considering human age divided into 9 stages, each of seven years, together making up the age of 63 years: implying that in each stage of seven years upward, a person undergoes some distinct change, both in proportion as the firmness of the flesh and certainty of movement; and strength. The increases initially seen in these aspects are later curtailed and restrained. The first seven years are called childhood. From there to fourteen years, the major or true childhood. From there to twenty-one, referred to as adolescence, because in this time the readiness for the responsibilities of manhood becomes apparent. From there to twenty-eight years, is the period of youth. This may be reflected in the saying, 'Old at twenty-eight,' referring to individuals who, despite moving beyond their youth, remain tied to it, as they are reluctant to grow older, unless merely in appearance. From twenty-eight to thirty-five, is known as manhood. From there to forty-two, the steady state of adulthood. From there to forty-nine, the first stage of old age. From forty-nine to fifty-six, was the age of advancement; And from those years to seventy-three and beyond, was the serious or decrepit old age. The great Hippocrates divided these more succinctly, by comparing them to the four seasons: Childhood is compared to spring, being warm and moist, suitable for growth. Manhood to summer, being warm and dry. The steady state of adulthood to autumn, being cold and moist. And the decrepit old age to winter.

Translation Notes:
'Mensch-beelden' refers to 'human images' or 'representations of humans'.
'Ouderdom' means 'age' and refers to stages of life. The term 'den ouden Agt en twintig' reflects an idiomatic expression possible akin to 'old soul at twenty-eight', inferring maturity despite youth.