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Shelly and Storme are teenagers.

They are also sisters, but they are not twins.

Shelly is older than Storme.

Both of their ages were composite numbers last year.

This year their ages are both prime numbers.

Over the next three years, both of their ages will remain composite numbers.

What is the sum of the ages of the two sisters?

Note: a composite number means that a whole number that has factors in addition to 1 and itself.

a prime number means that a whole number that has factors of 1 and itself.

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