It's hard to resist a shirtless [1] shot of your favorite celebrity. Now that Summer's here, the beach and pool outings are rolling in. Ryan Phillippe [2] looked as fit as ever on the beach in Miami [3], where he wasn't afraid of a little PDA with his girlfriend, Paulina Slagter. Meanwhile, all the way over in Hawaii, James Marsden strutted his stuff [4], and Chris Pratt showed off the physique [5] he worked so hard on for Guardians of the Galaxy. While we're waiting for even more Summer fun, who are we to deny ourselves a little extra shirtless [6] appreciation? We've pretty much determined that these guys are looking hot at every age, so keep scrolling to see all the shirtless glory from age 20 to age 45.

Source: FameFlyNet [7], Splash News Online [8]

20: Tom Daley

20 (Bonus): Patrick Schwarzenegger

21: Nick Jonas

22: Louis Tomlinson

(With a bonus Liam Payne!)

23: Garrett Clayton

24: Joe Jonas

25: Chord Overstreet

Source: Instagram user chordover [9]

26: Zac Efron

27: Michael B. Jordan

27 (Bonus): Sam Claflin

28: Daniel Sharman

Source: MTV [10]

29: Kellan Lutz

Source: Instagram user kellanlutz [11]

30: Chris Hemsworth

31: Lil Wayne

32: Jamie Dornan

33: Justin Timberlake

34: Chris Pratt

35: Adam Levine

36: Matt Bomer

37: Orlando Bloom

38: Colin Farrell

39: Ryan Phillippe

39 (Bonus): David Beckham

40: James Marsden

41: Neil Patrick Harris

Source: Instagram user instagranph [12]

42: Justin Theroux

43: Tyson Beckford

44: Donnie Wahlberg

Source: Twitter user donniewahlberg [13]

45: Will Smith

45 (Bonus): Hugh Jackman