An IM in his 20s getting GM title too late?

Yesterday I have read a couple of comments in a website about a player who after only recently finally released from the shackles of study and work (his employers blessed his ambitions) decides to go get the GM status. He's in his 20s and in the 2006 Olympiad in Turin even beat Korchnoi. A couple of people hiding behind near anonymous names started dissing him before he had a chance to prove anything. But one commentor pointed that there were many people who got their GM status later in life.

 http://blog.gilachess.com/mas-is-458-in-dubai/#comment-1774

 Is it still possible to get it in his 20s?

I'd be surprised if the majority of GM titles were earned before the age of 20.

This is a slightly different question from one that had been asked a while back. It is infinitely harder for a non-titled adult player to study to become a GM than it is for an adult who is already an IM and had learned chess at a young age.