Either way, it's super important to show the person you love turning 40 — whether that be your mom, dad, brother ... we've compiled the best 40th birthday wishes to share.

Wishing The Duke of Sussex a very happy 40th birthday ... Harry and his brother, as well as his strained relationship with their father, many see these first birthday messages in years as a ...

"Happy 40th brother. From the polo fields to all the ... The messages were unexpected, as public birthday wishes are usually reserved for working royals, though are sometimes made for milestone ...

The royal birthday boy has received grand birthday wishes from many as he embarks on this new decade of life, including big brother Prince ... of Sussex a very happy 40th birthday today!" ...

Prince William has wished his brother Harry a happy 40th birthday despite long-standing rumours of a rift between the pair. The Kensington Royal account retweeted an earlier happy birthday post ...