Had a very similar experience at a friends farm, old chap pulled into the yard, got out of his car, went into the house, luckily they knew him, turns out his daughter had been a previous occupant and he’d called to see her, his family were informed, and I tried to shut the gate, but he got in the car and shot off, before we could stop him as it turned out he had dementia and the car keys had been hidden, somehow he’d found them and went driving round, then called in to where he thought his daughter lived, he vanished and we actually went looking for him round all the villages, his son phoned later to say they’d found him and got him home safely, we twigged something wasn’t right as he seemed really confused and we were concerned that if he parked up and walked off he would get totally lost as it was in a really sparsely populated rural area.