• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

• Top
• 3 · Human Being, Man in General
• 31 · man in a general biological sense
• 31D · human life and its ages (young, adult, old, etc.)

31D3 · human life divided into decades

• 31D31 · 10-20 years
• 31D32 · 20-30 years
• 31D33 · 30-40 years
• 31D35 · 50-60 years
• 31D36 · 60-70 years
• 31D37 · 70-80 years
• 31D38 · 80-90 years
• 31D39 · 90-100 years