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I love the idea of there being numbered ages along with the physically apparent life stages. However, personally, I like my games to move fairly quickly, so maybe instead of only +1 age per in-game year, they could age +5 per in-game year and only celebrate / have a birthday once per year? Throughout the year you can check and see exactly what age they are, but for the birthday parties it will tell you what milestone number age they are reaching (regardless of whether they are evolving to another physical life stage or not). Then again, an age like 21 is pretty important in America, and babies change a ton in the first few years, so it might have to be a dynamic increment depending on the physical life stage they are in.
