But... that... that's one of the primary selling points of Linux (which is free, as you know): working marvelously on old hardware. You can even install entirely with no desktop if you're an expert in the terminal...
Well, you're very obviously knowledgeable about what you're doing, so carry on. I just think we don't have to be Amish with private information as long as we're aware of what we're using to access it.