<p><strong>Los Angeles:</strong> Robert Downey Jr has turned 52 and his "Avengers" co-stars wished him on his birthday in many hilarious ways. Actors Chris Hemsworth, Chris Evans and Mark Ruffalo took to Twitter to give a shout-out to Downey Jr on his birthday.</p>
<blockquote class="twitter-tweet" data-lang="en">
<p lang="en" dir="ltr">Happy birthday <a href="https://twitter.com/RobertDowneyJr">@RobertDowneyJr</a> you haven't aged a day since this picture <a href="https://t.co/bLLiDy7Czt">pic.twitter.com/bLLiDy7Czt</a></p>
&mdash; Chris Hemsworth (@chrishemsworth) <a href="https://twitter.com/chrishemsworth/status/849422862473736192">April 5, 2017</a></blockquote>
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<p>"Happy birthday @RobertDowneyJr you haven't aged a day since this picture," tweeted Chris Hemsworth, alongside a funny photograph, which shows the birthday boy donning a wig and appearing old and wrinkly with the 'Thor' star giving a thumbs-up.</p>
<blockquote class="twitter-tweet" data-lang="en">
<p lang="en" dir="ltr">Happy birthday to the legendary <a href="https://twitter.com/RobertDowneyJr">@RobertDowneyJr</a>. Mentor. Life-saver. Friend. Hope your birthday is like a giant kiss on the lips! <a href="https://t.co/GK60sd8QLK">pic.twitter.com/GK60sd8QLK</a></p>
&mdash; Chris Evans (@ChrisEvans) <a href="https://twitter.com/ChrisEvans/status/849305861667389440">April 4, 2017</a></blockquote>
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<p>While Chris Evans wrote, "Happy birthday to the legendary @RobertDowneyJr. Mentor. Life-saver. Friend. Hope your birthday is like a giant kiss on the lips!". The "Captain America" star posted a GIF alongside his sweet message which shows him going in for a smooch with Downey Jr dressed as Iron Man.</p>
<blockquote class="twitter-tweet" data-lang="en">
<p lang="en" dir="ltr">Happy birthday <a href="https://twitter.com/RobertDowneyJr">@robertdowneyjr</a>! A picture is worth a thousand words. <a href="https://twitter.com/hashtag/sciencebros4ever?src=hash">#sciencebros4ever</a> <a href="https://t.co/6oBygwbiV8">pic.twitter.com/6oBygwbiV8</a></p>
&mdash; Mark Ruffalo (@MarkRuffalo) <a href="https://twitter.com/MarkRuffalo/status/849310793422303233">April 4, 2017</a></blockquote>
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<p>Mark Ruffalo also took to Twitter and wrote, "Happy birthday @robertdowneyjr! A picture is worth a thousand words. #sciencebros4ever." The actor, who plays The Hulk in the Marvel franchise, shared a picture from "Jimmy Kimmel Live!" where he is sitting in Downey Jr's lap and gazing lovingly in his eyes, as the host along with the other 'Avengers' actors Scarlett Johansson, Jeremy Renner, Evans and Hemsworth watch the scene unfold in faux surprise.</p>

Robert Downey Jr has turned 52 and his "Avengers" co-stars wished him on his birthday in many hilarious ways. Actors Chris Hemsworth, Chris Evans and Mark Ruffalo took to Twitter to give a shout-out to Downey Jr on his birthday

'Avengers' co-stars funny birthday wishes for Robert Downey Jr

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<p>Robert Downey Jr has turned 52 and his "Avengers" co-stars wished him on his birthday in many hilarious ways. Actors Chris Hemsworth, Chris Evans and Mark Ruffalo took to Twitter to give a shout-out to Downey Jr on his birthday</p>

'Avengers' co-stars funny birthday wishes for Robert Downey Jr

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'Avengers' co-stars funny birthday wishes for Robert Downey Jr

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