According to the ancient Romans, there are five stages of human development:

0-15 years – Pueritia – early childhood and latent period of early school years

15-25 – Adulescentia – puberty and adolescence

25-40 – Luventus – first adulthood

40-55 – Virilitas – second adulthood

55+ – Senectus – old age

For more about the stages of life in different traditions and cultures, see Thomas Armstrong, The Human Odyssey:  Navigating the Twelve Stages of Life (Ixia Press, 2019).

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I am the author of 16 books including my latest: The Myth of the ADHD Child: 101 Ways to Improve Your Child's Behavior and Attention Span Without Drugs, Labels, or Coercion (Tarcher-Perigee).

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