5. (10 points) Yaoyao is discussing the upcoming year 2016 with her father. Yaoyao says: "I find the number 2016 very interesting. The last digit 6 is exactly twice the sum of the first three digits 2, 0, and 1." Her father says, "Then let's define years that meet this condition as 'Lucky Double Years'." Yaoyao quickly calculates and says, "After 2016, by the time the next 'Lucky Double Year' comes, I will already be 17 years old." So, in 2016, Yaoyao is $\qquad$ years old.
【Answer】Solution: According to the problem, we know:
The years starting with 201 do not meet the conditions.
Therefore, 2028 is the first year that meets the conditions.
In 2028, the age is 17 years old, and the time difference with 2016 is 12 years, so the age in 2016 is 5 years old.
Therefore, the answer is: 5