0 birth .................[the moment a baby is born]
Up to 12 months .......................a baby
12 months – 3 years old ...................a toddler
3–12 years old a child................: this period is your childhood
13–18 approximately a teenager:.... during this period you are in your teens
18+ an adult
40+ approximately people are middle-aged [in the middle of their lives]
60 or 65 retirement [when people stop work; they are retired]
80+ old age (we usually describe people as elderly
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