Q.pruning mature kiwi plants
I need help pruning mature kiwi plants (one male, two females) in Kitchener, Ontario, Canada. These plants are at least 18 years old. We got some berries the past few years but not a lot. How and when do we prune these roving vines and improve the crop?

Here are several articles that will help you with pruning and care information.
https://www.gardeningknowhow.com/edible/fruits/kiwi/pruning-kiwi-vines.htm
https://www.gardeningknowhow.com/edible/fruits/kiwi/growing-hardy-kiwi-vine.htm
https://www.gardeningknowhow.com/edible/fruits/kiwi/how-to-fertilize-kiwis.htm
https://www.gardeningknowhow.com/edible/fruits/kiwi/kiwi-plant-not-flowering.htm