For those who don't know, Captain Tom Moore is a national hero in the UK.
This would be admirable for anyone, but Moore was a 99-year-old World War II veteran.
So, for his 100th birthday on April 30, the people of the UK really turned out.
Hundreds of thousands of people sent cards, dozens of murals appeared around the country, and the Royal Air Force made a special appearance over Moore's house in Marston Moretaine, where he was celebrating with his family.
Moore was even promoted to the rank of an honorary colonel.
He said it was "quite extraordinary" to be turning 100.
“It is even more extraordinary that I am doing so with this many well-wishers," he said, "and I am in awe at the response my walking has had”.
Happy birthday, Colonel Moore!