Okay. So, it's a guy thing then. My husband always says a guy will always know where those things are. Yes, I walk. No. I didn't drive until recently. I only starting carrying those things around when I started to drive. But if I'm going somewhere where I don't need money and I'm not the driver... But, then again, someone is always home where I live, so I don't need keys. I didn't say it wasn't unusual for most people. Just that some people do go out that way and aren't trying to hide their identity.
If you just happen to come in contact with LEO (wrong place, wrong time) and they ask you for ID which you cannot provide, you can be held until they are satisfied as to who you are. My wallet is ALWAYS in my pocket, even if I’m just working on my own property. Only time I’m without it is when I’m in PJs.... or less.
You might want to consider carrying some sort of ID, just in case you get hurt or have a medical problem. It can make it easier to contact your family.