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You don't have to worry about the years, those are decided and well agreed upon, the Social Security administration has already done it for you.
They classify this because age has always had financial implications for when people can collect medicare, social security benefits, cash out 401Ks without penalties, etc.
Of course people's generational experiences will differ slightly, but not hugely so. As a general rule, two people born in 1984 and 1989 will have similar experiences compared to two people born in 2001 and 2007. >

Gottem