I'm going to speed with my grandma in the car.
Why would you want to drive dangerously with her?
She's 100, it's pointless to be careful at that age.
She might not feel that way. You should take care not to make your grandma uncomfortable.
She won't be uncomfortable. She won't notice, she is deaf anyways.
Just because she is deaf and old doesn't mean she won't be uncomfortable. She might not be able to express it well, but she will notice.