Variables for Text Tags can be set and later used as a way to easily change in one place or if you need very short fields (like checkboxes).
Setting a variable example:
{{set=a1:text:1:y:Age? }}
Using the variable example:
{{a1}} <- Replaced with the text field and all specified options
The first option in a variable is the variable name, all following options are the normal Text Tag options described earlier.