It most likely would run - but one might need to upgrade the RAM. Some budget video cards might not work, so you might need to upgrade those as well.
I check Fry's May 12 2006 sale, and virtually every system there would work as long as the 1 GiB RAM requirement is met.
In that ad, the MBP was a 1.83 GHz Core Duo with 512 MiB RAM and an X1600 graphics. The Imac had the same specs. Bump the RAM to 2 GiB, and these would be good Windows 7 systems. Not as snappy as a Core i7, but fine.
Windows 7 System Requirements
Agree if "older" means 6 to 10 years old. Five years ago was when the Core Duo was the headline CPU, and 3+ GHz Pentium 4 was the standard CPU (from Intel). Adding RAM would be important, since Win7 should have at least 2 GiB for good performance - and 512 MiB seemed to be the norm for mid-2006.