Jeffrey P. Bezos, the world’s richest man, on Thursday announced he was starting up philanthropic organizations focused on providing help to homeless families and preschools for low-income communities, a later start on charitable giving than many of his fellow billionaires.

Bezos is 54. Bill Gates was 54 years old when he announced The Giving Pledge in 2010. Since then, the Bezos nest egg has increased from $12.3 billion to $164 billion.