"On this day in 1960, Prince Andrew was born at Buckingham Palace, the first child born to a reigning monarch for 103 years".
A Palace spokeswoman said, "The tweet follows our house style and as was confirmed in November a year ago, The Duke has stepped back from his public duties and patronages for the foreseeable future and remains a member of the Royal Family".
It was originally thought that the Duke would have a significant celebration to celebrate the landmark birthday, with the Queen and members of his family attending.
Staff working at the Woking PizzaExpress branch were warned to watch out for undercover reporters asking surreptitious questions about Prince Andrew as the Duke celebrated his 60th birthday yesterday.More news: Without evidence, Bloomberg campaign blames Sanders supporters for spate of vandalism
While it looked like a normal greeting, it became headline-worthy after people noticed that the "His Royal Highness" title of Prince Andrew got dropped from the message.
Meanwhile Sarah Ferguson, 60, shared a photo of her ex-husband relaxing at home with two dogs, alongside an unusually subdued message.
"As such, we wanted to send a polite reminder that our policy remains the same and you should not directly comment on anything related to Prince Andrew or his birthday".
Instead, a "small family dinner" is to be held.
This is something that has been reflected in his official birthday message from the Queen and Buckingham Palace on social media.More news: Methane emissions caused by human activity vastly underestimated
It is still expected that his birthday will be marked by the ringing of bells at Westminster Abbey. Local authorities have discretion to choose when to fly it.
"The Duke and Duchess of Cambridge and their children", the Abbey said in a statement.
The duke deferred his promotion to admiral.
He was seen with the Queen at church near Sandringham shortly after a deal was struck between the Queen and Harry and Meghan allowing them to step back from senior duties of the Royal Family.More news: South Korea Reports First Two Coronavirus Deaths