I'm 51 years old and handicapped. I walk with a cane. I do have a parking placard.
I have had many people, old and young, give me a dirty look when they see that I've parked in a handicapped space. I have MS and a bad back and have trouble walking long distances.
However, I, too, have seen people park in the handicapped spaces with no placard at all. The police need to crack down on these people. Maybe if they know they're going to get a $250 ticket, they will quit parking in them.