When is too old to go clubbing?

[MJ22]

At what age do you start to look too old for a club? By that I mean, when you see the guy or lady in the corner who just looks really out of place. I'm 34 but I can pull off 28 or 29 because apparently I look young for my age but I saw a guy in a club recently who was about 50, grey and was just staring at every girl who passed by so I started thinking to myself how many more years do I have before I start looking like the old guy who's just there to perv at the girls (or guys of course if that's what you prefer). I know there are certain clubs who are aimed at younger people and others at over-30's but if it's just a regular club then at what age do you think people start to look a little bit out of place?