To count entries between dates and categorize them by age range in Excel, you can use a combination of functions including COUNTIFS, FIND, LEFT, RIGHT, SUMPRODUCT, and TEXTBEFORE.
The first step is to calculate the age by using the DATEDIF function to find the difference between the birth date and the current date.
Next, use the COUNTIFS function to count employees based on the age range and registration date criteria.
Alternatively, you can use the SUMPRODUCT function for more flexible filtering, or extract age from text data using FIND, LEFT, RIGHT, and TEXTBEFORE functions.