"Money is not wealth". Almost nobody that understands wealth holds money, money is a tool for exchanging things and its value decreases with time.
They hold real state, they hold precious metals, they hold stock, they travel, they know people.
The people that made money usually like making wealth and don't fear losing it so much, they learn all their life to handle risk with positive results. It is their children or grandchildren who fear it, because they don't.
The good thing about being rich is that you could be poor whenever you want. You could also help lots of people in your life, which feels amazing.