David,
In your model
-model "1+Time*Age+TrialDisplacement+TrialDisplacementSquared" \
the last two quantitative variables are assumed to have no interactions with other variables, so there is no point specifying their values. Just do the following :
-gltLabel 1 'T00' -gltCode 1 'Time : 1*T00 Age : 18' \
Gang