<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by AS Flyer:
Each person in the exit row must be able-bodied, not just one. That basically means that they must have full use of their arms and legs and be able to see out the windows and hear, understand and follow instructions given by the flight crew in an emergency. They also must be at least 15 years old. </font>
This is the same system BA now uses, Exit rows are often blocked and can only be released when the checkin agent decides you are capable of opening the doors. In the past they would never really look at the people sitting in those rows but nowadays I've seen people be moved because they are too young, old small or large to operate the door.