R help - Mar 2009 - VGAM and cnstraints

Dear R-Users,

I am learning how to use the package VGAM to do multinomial regressions.

I have worked through the example provided by UCLA stats group:

http://www.ats.ucla.edu/stat/r/dae/mlogit.htm

However - what I would like to learn is how to use the constraint option.

So in the example given in the link i would like to introduce a constraint that 
does not allow individuals of age less than say 25 to buy brand 1 (for whatever
reason)

how do I enter this constraint?

Thanks.

Raff.  

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