61. Xiao Gang is Xiao Ming's cousin. It is known that the cube of Xiao Gang's age this year is a four-digit number, and the fourth power of his age is a six-digit number; if these two numbers are combined, they exactly use all ten digits $0,1,2,3,4,5,6$, $7,8,9$ without repetition. Moreover, the sum of Xiao Ming's and Xiao Gang's ages this year can be divided by 2, 3, and 5. Xiao Ming is $\qquad$ years old this year.
answer: 12