Answer: 13,879 days
If Joan's father is 38 years old today, that means that he was born in 1982. (2020-38=1982).
If we multiply 38 years by 365 days per year, we get 13,870 days.
But we need to take into account leap years, which happen every 4 years! In a leap year, there's an extra day in February. There have been 9 leap years since Joan's father was born.
So, we add 9 days to 13870 days, to get: 13,879 days.
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