Prince George
Prince George has to eventually follow these royal rules when he gets older. Pictured: Prince George eats a sweet as he leave following the service at St Mark's Church on Christmas Day on Dec. 25, 2016 in Bucklebury, Berkshire. Getty Images/Andrew Matthews

Prince William and Kate Middleton do not want to pressure Prince George for his future responsibility in the throne, but the 5-year-old royal will eventually need to follow certain protocols from the palace.

The Duke and Duchess of Cambridge wanted their children to live like normal kids. In fact, according to Catherine Mayer, author of the book "Charles: The Heart of a King," Prince William and Middleton wanted to "delay that moment of realization to give him [Prince George] normality before they thrust this on him."

However, Prince George has to eventually follow certain royal rules. Prince George just turned 5 years old and in 3 years, he is expected to dress differently. Here are the different protocols that the 5-year-old future king will have to adhere when he gets older, according to Caitlyn Doherty of Daily Express.

1. He should wear pants when he's older than 8

Royal boys are encouraged to wear shorts until they are 8 years old. This is the reason, Prince George was only seen in long trousers once.

In the rite of passage dating back to the 16th century, young boys would only graduate to long trousers around the age of 8 to signify that they are growing up. Prince George was only seen in pants at Prince Harry and Meghan Markle's royal wedding.

2. He should not accept gifts from strangers

When the royals celebrate big events including birthdays and weddings, the public tends to react warmly by sending them presents. However, they are discouraged to accept presents from people they do not know.

According to the official royal guidelines, "gifts offered by private individuals living in the UK not personally known to the member of the Royal Family should be refused where there are concerns about the propriety of motives of the donor or the gift itself."

The Duke and Duchess of Sussex also received tons of wedding gifts. However, they have to return the presents worth millions back because they do not want to exploit the gifts for commercial purposes.

3. He should take separate flights from his parents when he is 12

Prince William and Middleton are discouraged to travel abroad with Prince George. According to the royal protocol, no two direct heirs are allowed to board on the same plane at the same time. This aims to prevent the line of succession from being affected in case of a crash.

The Duke and Duchess of Cambridge have to comply to this protocol, but Prince Harry and Markle may not necessarily follow it. The Duke and Duchess of Sussex are already sixth-in-line to the throne, so they can travel freely with their kids.