DAY 47

Comment

There are 365 days in a year (usually).
1 in 365 is about 3 in 1000, which can be written as 0.003.

(It is perhaps odd, and not very useful, to express an age as a decimal. But it is one of the nice, and powerful, things about mathematics that you can do such things, as long as you still operate consistently.)

Answer

About 101.618 years.

Readers' methods

Desmond Relph, Genoa:
101.615 is about 101.615 x 365.25 days = 37114.878 days (according to my calculator).
so this time tomorrow Winifred will be about 37115.878 days old, which is about 37115.878 divided by 365.25 years old, which is about 101.61773 years old.

xxx