And 50 years after she became Duchess of Gloucester. So, very clearly a way to mark a half century of tireless service and dedication to the Royal Family.
I used to think Sophie might be in line to receive the Garter but now, given that Edward has been given the Thistle in honor and recognition of the Edinburgh title, it might be that Sophie is given the Thistle instead. I do agree, though, it's not something we can likely expect in the near future though. Birgitte is 77 while Sophie is 59. I could see something maybe around her 40 year mark as a working royal which would be in 18 years when she is 77.