The reason could be to draw attention and make the story or scene involving the old lady more engaging. It might also be to add a touch of fantasy or whimsy to the overall setting.
The old lady's aching muscles in the cartoon might be due to a long period of standing or sitting in an uncomfortable position. Another possibility is that she's dealing with the effects of aging on her body.
Maybe she's allergic to something in the cartoon world.
Maybe she saw something funny or was told a joke.
It could be for various reasons. Maybe it's to highlight a character's tiredness or to set a peaceful scene. Or it might be a way to introduce a funny or unexpected element.
Maybe she's facing some kind of trouble or challenge that makes her worried.
Maybe she's really tired and her body relaxes so much that she snores. It's a common reaction when someone is in a deep sleep.
An old lady's cartoon voice is often soft and gentle, with a slightly raspy or crackly quality. It might have a slower pace and a more mature tone.
Maybe it's to convey a sense of hardship or to evoke empathy. It could be a way to tell a story about her struggles.
The reason might be to add an element of surprise or mystery. It could be a symbol of something or a way to draw attention and make viewers curious.
Maybe it's part of the character's personality. The lazy voice could be used to show that the dog is laid-back or not very energetic.