I am in my mid-twenties and I frequently use public transit in my city. Sometimes I notice someone get on the bus who appears to be much older than me but still seems young enough to have no problem standing (maybe in their 40's or 50's). Assuming they have no invisible ailments like arthritis or chronic pain, is it rude of me to offer my seat up to them?
Many people in my city would take offence to being called old/incapable and I don't want to offend anyone, but I know I should be offering my seat to older patrons.
Context: I am in Canada and in many cities there are priority seats which may be taken by anyone but priority is given to seniors (EDIT: "older patrons" typically, implying seniors), pregnant ladies, people with young children, or disabled people. No one enforces these rules, you are just expected to give up your seat when you see someone get on the bus.