Doug, you're very lucky to find that marriage record. No doubt about it, in my mind, this is the same couple. McQuade is another spelling of the name so that is no problem. It is Bernard so that fits. Bridget fits. And Stars is so close to Starr. It's hard to believe there was another Bernard in Lowell that married a Bridget, and even harder to believe that her maiden name was Stars and the other was Starr. This is the same family. I am certain of it.
Ages are always off, don't let that throw you off. Many people didn't know their ages, or priests guessed or so many other things so don't worry about that.
I bet you big that this is the same couple as the one you mentioned in the previous query. If you can provide me with the names of Bernard and Bridget's children, it may give me enough to be sure of myself and say this is the same family, but right now I'm just guessing.