How can I get my dog to play?  

Animals are just like people and when they get older they don't have the energy they used to do . It is very possible that your dog really is just to tired to play and doesn't want to and would much prefer you to take the time to talk to her and pet her then for you to throw a ball for her to play with .
I wouldn't worry about it at all , I would really think it is because of her age but if you are really concerned you could try giving the vet a call and ask their advice .
Best of luck !!

My dog is 12 too and for the last year or so he has decreased his interest in fetching and playing in general. He still enjoys walks though and loves swimming. Does yours still like to walk? Excercise is really good for them, it keeps them from getting old too fast so if you can find any form of excercise she likes try and get her to excercise some at least every other day. They do slow down when they get older but they will not slow down as much if they get regular excercise.

I too have an older dog (13) and I'm just glad he can get up the porch steps every day. My younger dog (11) is a bit more frisky. She's a very happy dog in general. I don't know if maybe bringing treats into the mix would help but I haven't ever met a dog that didn't like to eat.

U just try to make it involve in any activites,which r playful 4 ya dog,such throwin ball or a stick and tell to fetch,the mor activity u make the dog involve,the mor it becomes activ..