Do you like its sound,though?  If you do, best leave well alone.   Bear in mind, too, that the more you play it, and the more you take it out to pubs, the dirtier it will get, the more rosin it will have stuck to it, the more general crap and detritus will adhere to the deposits of rosin, and dust...

Before long you'll be wanting a recommendation for a good varnish cleaner.  Please don't worry about having a fiddle that looks new; they all start out that way.  Why do you want it to look old?  Nobody who knows anything will be fooled for a moment unless it sounds old, too!

Malcolm