Xiaohong and Xiaoming were discussing age, Xiaohong said: "I am younger than you, when you are my age, my age is a prime number." Xiaoming said: "When you grow up to my age, my age Age is also a prime number." Xiaohong said: "I found that the sum of our ages is the square of a prime number." So how old is Xiaoming this year? (Xiaoming is younger than 31 years old this year, all ages are integers)
小红、小明二人在讨论年龄，小红说："我比你小，当你像我这么大时，我的年龄是个质数．"小明说："当你长到我这么大时，我的年龄也是个质数．"小红说："我发现现在咱俩的年龄和是个质数的平方．"那么小明今年多少岁．(小明今年年龄小于31岁，切年龄均为整数岁)
<gadget id="calculator">9 + 7</gadget>
<output>16</output>

<result>16</result>