FIFA introduced the MRI scan in 2009 to test eligibility of players entering the U17 World Cup, it is considered to be 99% accurate until the age of 17. Professor Jiri Dvorak of FIFA said: "The efficiency stops at 17 and it's just pure coincidence that Fifa made their competition an under-17 event"
In 1989 Nigeria were banned from competing in tournaments like U20 because they fielded not one but many over age players. After Nigeria spanked Japan 9-0, Japan’s French head coach Philippe Troussier joked that he saw one of Nigeria’s players after the game driving home his wife and kids.
Players like Falcao and Diego Costa are often the butt of jokes for looking older than their years, does this video prove that Costa is essentially a grumpy old man now? https://www.facebook.com/AllTimeConspiracies/videos/923362227741003/