The very thought of it creeps me out.
When I was an innocent undergraduate, living at home and therefore lacking in that famous student-style social life, I used to see this guy hanging around the library. He must've been about fifty, all white-haired and crinkly-skinned, though he assured me he was a bona fide student. I was a lonely wee soul in those days, so I chatted to him whenever I saw him. He never asked me out, thank gawd, but later on I found out that he made a habit of selectively chatting to the younger female Asian students. Years later, when I was working, I found out from a Chinese guy friend that his younger sister actually lived with that old guy for a while.
And now it seems I have an old-white-guy stalker. I take my mum to the open-air produce market every Sunday morning, and I keep seeing this one guy looking at me. I spoke to him once - he started a conversation and my customer service habit made it impossible for me not to reply - and ever since then, I'd spot him noticing me. He'd wind his way around the fruit and vege crates to get to where I was standing, while I'd pretend not to see him as I wandered in the opposite direction.
It just reminds me of that time I was in Thailand, when I was walking behind a tall, middle-aged white guy holding hands with a very young-looking Thai girl (us Asians look young for our age, I know - but even so, she can't have been more than twelve).
I hoped like crazy that he was just a friend of her parents', taking her out for a platonic ice-cream...