You may try analysis of covariance.
But,as you say"There are no gender differences in age ",then why not combine
2 gender's age and ignore the gender?

2011/3/1 Jonathan DuBois <jonathan.m.dubois@gmail.com>

> Hi,
>
> I am new to R, so I am unsure of the formula to set up this analysis.
> I would like to run a linear model with a continuous dependent
> variable (brain volume) and a continuous independent variable (age)
> while controlling for a categorical nuisance variable (gender).
>
> Age and brain volume are correlated.
> There are no gender differences in age but there are significant
> gender differences in brain volume.
> Therefore, I would like to control for gender when assessing the
> association between brain volume and age.
>
> Any help would be very much appreciated.
>
> Jon
>
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