How well do you know your celebrity ages — is Matthew McConaughey older than Penelope Cruz? How about Jay-Z and Gwyneth Paltrow? Forty and fabulous is one of the hottest new phrases in Hollywood, so we created this fun game to see just whether you can guess how old some of the biggest stars in the world are. We've rounded up a gallery of big names for you to test your skills on who has or hasn't crossed the 40 milestone. Click here or below to play!