JOIN USGlobal leaders and ordinary people in South Africa and abroad have committed to devoting 67 minutes of their time to community service, to mark the number of years Mandela spent in politics.
His birthday was in 2009 recognised by the United Nations as "Nelson Mandela International Day" and will be celebrated across the world.
The increasingly frail leader is spending the day with family at his Johannesburg home.
Local politicians united in wishing the anti-apartheid icon well on his birthday, with international leaders hailing his contribution to global politics and the fight for human rights.
"President Mandela has given 67 years of his life, now what we all could do is try to use 67 minutes of our lives, and change the world for the better," said Martti Ahtisaari, former president of Finland.
Ahtisaari is a member of The Elders, an independent group of eminent global leaders formed by Mandela in 2008.
Mandela was jailed for 27 years by the country's white minority government for resisting apartheid rule.
On his release in 1990, he led negotiations with apartheid rulers, a process that culminated in his election as the country's first black president in 1994.
US Secretary of State Hillary Clinton described Mandela as a hero to people of all backgrounds.
"His story is filled with an amazing strength and integrity of spirit. There is no one more deserving of this unprecedented international recognition," said Clinton.
"I am delighted to offer him my warmest wishes on this special day," she added.
Mandela has made few public appearances since he retired from public life in 2004.
Last week he arrived at the World Cup closing ceremony to wave at adoring football fans before the final match kick-off. He did not stay for the game.
He had campaigned for the country to host the event, but the death of his great-grandchild on the eve of the tournament's opening forced him to cancel his planned appearance.
His family said a group of nearly 100 children from villages around his childhood home in the rural Eastern Cape province would spend the day with him.