Note 17 — COOK’S ORACLE:

The Teeth are renewed at the 7th year. Puberty arrives at twice seven 14. Full stature at three times seven 21. The vigour of growth at four times seven 28. The greatest vigour of Body and Mind at five times seven 35. The commencement of decay at six times seven 42. General Decay, and decrease of energy, at seven times seven 49. Old Age at eight times seven 56. And the grand climacteric of the Ancients at nine times seven 63. Dr. Jameson on the Changes of the Human Body, p. 31.