Making Roger Federer and Rafael Nadal look extra young, Bob and Mike Bryan turned 40 years old on Sunday, prompting birthday messages from Dirk Nowitzki, Jack Nicklaus and many tennis legends.

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After 20 professional years, 16 Grand Slam titles together and over 1,000 matches won, the twins are still going strong. They've won the past two ATP Masters 1000 events, in Monte Carlo and Miami, and they made the final in Indian Wells.

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In their careers they've also won the 2007 Davis Cup, the 2012 Olympic men's doubles gold medal and 11 total mixed doubles majors.

The Bryans have each spent more than 430 weeks with the No. 1 doubles ranking, well over 100 weeks more than Federer has had as the top singles player. They currently share the No. 5 spot, though they've been rising rapidly in their resurgence since March.