Billionaire of the day

Klaus-Michael Kühne (born 2 June 1937) is honorary chairman and majority owner (53.30%) of Kühne + Nagel, co-founded by his grandfather, August Kühne
Kühne’s net worth is US$ 18.1 billion
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Majority of billionaires are old people who have accumulated wealth through investments over time.It s only recently younger people in the 30’s and 40’s are able to cross that billion threshold without inheritance thanks largely to the internet.

Zuckerberg hit a billion at 23, what are most of us doing at that age?