When you select plants in the main window, the age of the focused plant8IN1RV>second is shown in the Age panel. Changing the age of the focused plant sets the age of all selected plants to the new value.

The maximum age of any plant is a parameter you can change. If you set the age of the selected plants higher than a particular plant's maximum age, that plant's age will stop there.

To change the age of all selected plants,

       Click on the red line on the age/biomass graph and drag to the left or right.

       -or-

       Click the up or down buttons next to the age box under the graph.

       -or-

       Type a new number in the age box under the graph, then press Tab or Enter.

       -or-

       Click the Animate button on the Age panel on the main window, or choose Animate from the Plant menu. When the plant gets to an age you want it to stay at, press any key on the keyboard. 

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