simentals? or limousin?

[k bar b ranch]

what is the ave. productive years for a female simmental and also a limousin female cow.

 

[A. delaGarza]

I have seen 15 years old cows calving of both breeds but after 12 I think they should be burger meat

what is the ave. productive years for a female simmental and also a limousin female cow.