Is it normal i got off to a 40-year-old woman's cracked heels?

I was trawling through Facebook photos for wank material, and stumbled across a photo of a friend of a friend of a friend of a friend. In the photo, she was fixing something in her garden, and was squatting, which made the soles of her feet visible (she was wearing flip-flops). Now, I have a foot fetish, but normally they have to be very nice feet. This woman's feet were far from perfect, and she had cracked heels, but something about that really got me off. Perhaps it was the way she obviously didn't mind this being so obvious in a photo that added to the arousal. She might not have noticed, to be honest. Either way, it did it for me big time.