Answer:
Shirley is 28.
Explanation:
Well, to quickly find it:
We'd have to find two numbers that fit this description.
We already know it is going to be within the late 20's and early 30's at the start.
So we start with:
28 + 3 = 31
Then to verify we add these two numbers:
31 + 28 = 59
Now applying to the descriptions,
Shirley would be three years younger Susan.
So Susan would be 31. Shirley is 28.