No you are not old fashioned. Manners cost nothing but gain a lot. My great nephews are brought to task by their parents and grand parents if the fail to say please and thank you. Good manners are basic things that should be taught early by parents.
I get the same when I am out and about, I was always taught to hold a door open for a lady or gent, I still do that but the number of times a simple thank you is given is very low.