I have 55-year-old hardwood floors in my Cape Cod and the finish has completely worn away. I don't want to refinish the floors because the new gaps left from the removal of 3 walls would make it look piecemeal. So I'm going to put down a new, prefinished hardwood floor over the old one.

I have installed hardwood before, but never over existing hardwood. Am I asking for trouble if I run the new wood in the same direction as the old wood?