There are eight brothers and sisters in a family: Georgette, Ulysses, Yvan, Marie, Annette, Roger, Isidore and Emile. All are less then 10 years old. If you represent the age of each child by the first letter of its name, you obtain:

                    
                      Y U
              ------------
       G U Y  | M A R I E             
                M A R E
                ---------
                      E E

Also, R I * Y = B M R

If Marie is the youngest of the sisters, what is her age?