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So far my model runs by generating turtles that go at random headings.  When they hit a peak, their health decreases by 1 (health initally set to 100).  Throughout the model running, there is a timer.  For every 5 seconds, every turtle gains one year of age.  Something I am planning to implement this week is: once the turtle reaches a certain age, its process of decision making changes from a snap decision (performed by the young, or < 30 to a lengthy process of decision making (reserved for the older crowd of turtles).  I am going to add a plot as soon as I can get the health per turtle working as well as a regeneration of turtles as turtles die out.