In 1997, Teacher Bao's age was exactly the sum of the numbers in the year of birth. How old is Teacher Bao this year?
1997年，包老师的岁数恰好是出生年份的各个数字之和，请问包老师今年几岁了？
<gadget id="calculator">1_997 - 1_975</gadget>
<output>22</output>

<result>22</result>