how can ACT-R models age?

[Dario Salvucci]

aging?  In particular, I'm wondering if anyone has done work toward 
the following question: Given a "young expert" ACT-R model, is there 
a general (domain-independent) way of making it an "elderly" model 
simply by changing appropriate parameters?  For instance, one might 
imagine that cycle time increases by some percentage causing general 
slowdown (there seems to be EPIC work suggesting this), or that W 
decreases, and/or that the latency of certain perceptual-motor 
parameters increases.  I'm specifically interested in modeling 
elderly drivers using an existing model of younger drivers, but I'm 
hoping to carry over any related results / parameter changes from 
other domains if at all possible.

Thanks, and best wishes for the new year,
Dario

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Dario Salvucci
Cambridge Basic Research
Email: dario at cbr.com
Info: http://www.cbr.com/~dario