The bottom line is that the date DATEDIF formulation is a safer and easier option when the objective is to report age in whole years. Note start and 
end dates stay the identical in all three DATEDIFs; solely the unit is changed. This formula will return Michael Chang’s age on January 1, 2022, which is 20.
Carbon-14 is radioactive, with a half-life of about 5,seven-hundred years. Thus the overall sample, that males are older—and only considerably older—seems to face, making age-gap relationships unusual. The “best” three-ish-year age gap with men older than women, noticed cross-culturally, might mirror its optimal selective health.
