I was just thinking about this since my adult kids have MB+ from the parks. I think mine would still need to wear their lanyards to be in adult areas because they look young, even though they're almost 20 and 24. We just flew to Orlando and TSA thought the almost 20 yr old was a minor not needing ID. And that 19 yr old was 'carded' when we went in the empty adult pool on the Dream last summer....so I think we'll leave the MB+ at home when we do the Alaska cruise next summer.