swimming / lifeguard

Just been swimming with all 3 sons and then I did a quick 30 lengths in the big pool. As I came out the v.cute but young lifeguard said "good swim", now in my head he was saying "hey good swim, you were looking really fit" so I said thanks in a kind of flirty way. It was only later that I realised he might have been saying "good swim?". The fact that I then looked in the mirror and realised I was wearing a dodgy swimming costume with a swimming cap and indents around my eyes from my goggles made me realise I don't think he was flirting...... Oh dear, I must realised I'm a thirty something mother of 3.