How do I edit my age on Halo Waypoint?

My Xbox Live account was changed from a child account to an Adult account but Halo Waypoint is still saying I am in a child account. Does anyone know how I can change this? I already tried deleting my history/cache on my xbox. That didn’t work, when I opened IE I was still signed into Halo Waypoint. Any advise would be greatly appreciated. Thanks in advance!