114 years, 28 days, and 4 hours
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4,000,000 hours ÷ 24 hours/day ÷ 365 days/yr = 456.6 years old
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It would appear that a merged question has affected this answer.
Start with 1 million (not 4 m) hours and use 365.25 days per year rather than 365 to allow for leap years (but not adjusting for leap centuries)
= 1,000,000/(24*365.25) = 114.08 years approx.