Minh b?ch là m?t trong nh?ng ?u ?i?m n?i b?t c?a các ch??ng trình khuy?n mãi OK9, mang ??n cho ng??i ch?i nhi?u l?i ích nh? sau:Median Age is the typical age of the population. Fifty percent from the inhabitants is older and one other 50 percent is young. Gender is self-documented by individuals when requested regarding their sex at start. 39.