Slip-up

One day this week I got back from fieldwork and as I walked up the garden path, drew my travelcard out of my pocket...to open the front door. Yes, I had been travelling all day, but even so, quite a seriously inappropriate slip.

I suppose this would be categorised as an associative action slip: I was going into the house, not getting onto a bus or train. Does this get worse as you get older, I wonder, or perhaps is there a relation to tiredness?