When it comes to deleting old data from a worksheet in Excel, there are a few different ways that you can go about doing this. One way is to simply delete the entire worksheet. This can be done by right-clicking on the worksheet tab and selecting 'Delete' from the drop-down menu. Another way is to delete only the data within the worksheet, without deleting the actual worksheet itself. To do this, you will need to select all of the cells that contain data (excluding any header or footer cells), and then press the delete key on your keyboard. You can also use the 'Clear Contents' command from the 'Home' tab in the ribbon. Simply select all of the cells that you want to clear and click on the 'Clear Contents' button. This will remove all data from those cells, but will leave the cells themselves intact. Finally, if you only want to delete certain types of data from your worksheet, such as formulas or formatting, you can use the 'Find & Select' command from the 'Home' tab in the ribbon. Select 'Go To Special' from the drop-down menu and then choose which type of data you want to delete. For example, if you want to delete all formulas, select 'Formulas' from the list and then click 'OK'. All of the formulas in your worksheet will be selected and you can simply press the delete key on your keyboard to remove them.