Normal
Generally do something in the last 3ish years is what I've been told at open days and events. That being said, I've never written the actual year when talking about this stuff so theoretically it could be from whenever. Furthermore, if the achievement is truly outstanding then I feel like it doesn't really matter if you were a bit younger when you did it as it's still a testament to you as a person, depending on how much you were personally involved (as opposed to something you were forced to do/lots of people did).