Here's a quick and dirty formula you can use in Google Sheets to get a running count of cells that contain any value (numbers, dates, text, links, etc.).

You can use SUMIF in Google Sheets to add numbers together that are associated with a date range, specific text, or meet a numeric criterion.

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.