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Dyan Efron 's stellar looks over the years will make you wanna DANCE!

Here is a 17-year-old version of a shaggy Dylan rockin' curls in Aspen, Colorado for an Audi dinner back in 2009 ( left ). This was long before he broke through the media as Zac Efron 's younger, hotter brother!

And, 16 years later, the shredded star unbuttoned for the cameras at a music festival earlier this year ( right). Dylan has brought his chiseled looks to this season of "Dancing With The Stars," and although he's only rang in a couple of 10s ... he's always a 10 in our eyes! Gallery Launch Gallery

The key question here is: Good Genes or Good Docs?!

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