What does the age of a planet have to do with light coming from an older distant object? If a new planet is formed tomorrow, it too will receive the same old light.
The same goes for a star. Even if God created a star with light only at the surface, we know that the light generated by a star actually comes from beneath the surface. So a star can't be created instantaneously without the "appearance" of age.
The only problem I have is with things like novas. If we observe a nova 100,000 light years away how can it have happened within the last 10,000 years (ie, since Creation)? If the speed of light was faster in the past, that would help to explain it.
Far Sider's objection is that in a young universe the light would have to be created already on its way to earth at all points between earth and the distant source. No problem with that so far, but, it means that some observers in the universe will have sharp disagreements about the order of events in various places. I.e., cause and effect get to be ambiguous, and, I suppose, free will goes out the window.