To calculate age in Google Sheets, use the DATEDIF or YEARFRAC formulas. I’ll cover each in detail below. Follow along for screenshots and full formula explanations. Formulas that Calculate Age in ...

DATEDIF(), which means Date + Dif, is a compatibility function left over from Lotus 1-2-3 that Microsoft adopted in Excel version 2000, which is the only version that explains how this function works.