Today I was taking photos of waves. As I was doing so, two lads came into frame, one with a fishing rod, the other with a bike. Both were far enough away that could not see their faces and they made good sillouettes against the background so I took a few frames as the chap with the fishing rod started to fish. Meanwhile, whilst I was shooting, the other lad took off his top and teased the waves running in and out. Without thinking I continued to take frames as waves caught him. A passer-by gently said as he passed me "you want to be careful taking pictures of under-18's". Thinking it through on returning home, I took his point that they were probably under 18 (I guess 15 or 16) and that the lad with top off might possibly be construed as an issue so I deleted all of the shots taken of them in the camera immediately without even looking at them, let alone copying them, Is this reasonable behaviour on my part?