Here in the US there are very few 'experts' suggesting that over-12s do not get the vaccine - the vast majority say they should get it.
For me the experts I listened to when making the decision included the federal CDC, the Maine state CDC, the FDA, the American Academy of Pediatrics, the CDC's Advisory Committee on Immunization Practices, the American Heart Association, the American Medical Association, the American Nurses Association, Johns Hopkins All Children's Hospital, the American College of Cardiology, the National Association of Pediatric Nurse Practitioners and my children's GP.
I also talked in person with a friend who used to be head of the Maine CDC and is now chief health improvement officer for Maine's largest health network.
Many of my children's friend's parents are also doctors, and all of them got the vaccine as soon as they were old enough.