What age is a JRT too old to have Puppys ?

I have a lovely Jack Russell terrier who two years ago had 4 of the most gorgeous pups now everyone who has seen them wants one and she is 5 what age will she be too old to have any more puppy's n how many litters would be the limit . i only want one or two more litters and to give at least a year between each litter . she is healthy and quite a small breed. Thank you .

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