I agree with with Heluvaskier and HH has said the same thing. Maybe if you are younger or lucky you don't feel it, but the extra stress is there.
Crap. Am I old now? 
Naww. IMO, as long as u can generate those kind of forces and angles then you aren't old, no matter what your age.

of course, if you were really knock kneed then the wide skis would be less of a problem.