You can create turtle variables by typing the turtles-own command at the top of the procedures window. In this case the variables energy and age are created for every turtle. To learn more about all of the commands created when you create a variable, see the StarLogo documentation on variables . This spacing is important. You can check any variable of any turtle by double clicking on the turtle, bringing up a turtle monitor.
Explorations Create an age variable that increases by a small amount every step a turtle takes.
Then monitor the change with a turtle monitor window.