Look at it. Just look at it. The SR-71 aircraft still makes me stare in slack-jawed wonder (and I’ve seen an F-117 in person).
Beautifully designed things can remain fresh-looking for incredibly long periods of time, if they’re truly exceptional. The SR-71, designed in the early 1960s by Kelly Johnson, is just one example. It was so fantastic of a design that twenty years later it still “inspired” many comic book imitations (X-Men, Transformers, and GI Joe, off the top of my head).
There are some other classic designs that really stand up over time:
The Barcelona Chair, designed by Mies van der Rohe in 1929 for the World’s Fair.
Levis 501 Denim Jeans, designed in 1857.
American Airlines logo, designed by Vignelli Associates in 1957.