Mama seemed more middle aged than elderly in the later shows...
One major thing I notice is that in the NBC shows, Mama is played as an old lady- some times fussy and grumpy and a little bit "behind the times". Being that her character is only in her 60s, I guess they tried a different formula later on. When they made her more of a middle aged character and less "old lady" like it seemed to be more age appropriate. Although I always thought her character was supposed to be closer to 70 . But I think they made her more "hip" for younger audiences. I find that is one of the major differences in her character between the network and syndies.
"Life is like a box of Krispy Kreme donuts".