How Old Is J.? J. Birthday
J. was born in 1946 and is 78 years old now.
Birthday: 1946
How Old - Age: 78
J. Death Fact Check
J. is alive and kicking and is currently 78 years old.
Please ignore rumors and hoaxes.
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J. - Biography
Johannes "Hans" van Leeuwen (born 1946 in Gouda) is a Dutch-American professor of Civil, Construction and Environmental Engineering at Iowa State University and an entrepreneur.
