Thread:Primexit/@comment-29331244-20160227043021

I'm (9^8 X 8^7 X 7^6 X 6^5 X 5^4 X 4^3 X 3^2 X 2^1 X 1)/(91^3 X 2) years old which are the same number of Maganese's electron in normal state :1

Solve it without google or calculator :1 