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Now, when non-dimensionalising an equation, i believe the purpose is to remove the units from it? Now, we are talking about a biological population and are told 't' is time, 'a' is the age of the animal and amax is the maximum age an animal can reach. Now when non-dimensionalising the given equation we're told that

tau = t / amax

I'm not to sure what exactly time over the maximum age of the animal actually represnts, could anybody help enlighten me? Thanks