One of the many wonderful things about LEGO is how almost all of the parts produced over multiple decades are compatible. Several years ago, when building a fish & chips shop, I was able to use a parasol, 25 years after I got it as a part of a set that was a gift for my 8th birthday. Another great example is visible on the hot rod built by Larry Lars.
Builders of real-world hot rods often combine an old body with a shiny new engine. Similarly, Larry uses mudguards and brand new wheels from the speed champions sets and recently introduced curved parts with a part that is even older than my parasol: the roof from a Fabuland car. It is a perfect combination.