The 50's were right in the middle of the transition from hardwood floors to carpeting. The Bushes were fairly wealthy, so it very possible that they had carpet put down over the hardwood. However, standard oak flooring that would have been used in that period can be installed today for $8 to $10 per foot depending on the part of the country you live in.
Homes from this period have almost none of the elaborate crowns or other moldings that were typical earlier in the century. Post WWII were generally well-build, but they were built to be affordable for the middle class and that is exactly what this house appears to be.