I agree with Emma; his behaviour is rude and respectless. I would give him a taste of his medicine and look at younger men when he is with you. If he comments on it, talk to him how he makes you feel. tell him anyway, even if you don't want to look at younger man, if he loves and respects you he will change his attitude.
There's no excuse for a guy making you aware that he's checking out other women. It's appalling manners. We've let guys get away with it too long by accepting the flimsy excuse that they are genetically like that.
But sex isn't the issue. This is about having some respect for the person you're with.
Men and women check each other out constantly, but most try to do it with some tact. If the man you are seeing doesn't get the message, I'd suggest you sit down and watch a movie with some nice male torso action. Comment on what an incredible body the actor has. I guarantee that within moments your boyfriend will be sulking like a five-year-old.
Explain that he makes you feel like this whenever he goggles at a girl. If he's a nice guy, he'll realise what an ass he's been!
You can tell him that it bothers you and ask him to at least try to be a bit more subtle about it. As long as he's not being unfaithful you may have to accept that most men check out other women (it's in their DNA) but that many have trained themselves to be a little more discrete about it - out of respect for their partners. We all have our faults, you just have to figure out which ones you can live with.
Don't worry about it too much. I'm sure these younger women don't want a 50 year old man as a partner. Just accept that he will look at other women.
However if its TOO obvious you need to say something to him
You can tell him it bothers you and you can also let him know that some young men still turn your head.
Ever notice how jealous they get when you stare too long a male model in an underwear ad?
At a recent party, I was talking to four female friends. A male acquaintance of mine walked past, said a quick hello to me and walked on. I thought none of the other women had noticed him - until he was out of earshot and in unison they asked for his name, number and if he was single. It's all about doing it discreetly.
I definitely think that he should be discreet if he is looking at other women while in your presence! That's just rude!
Also, it is a well-known fact that many young men have fantasies about being with older women. It's their maturity and knowledge as well as their inner and outer beauty. Some of them are just dying for you to teach them a thing or two about how to please you sexually!
Remember...there's two sides to every coin ;-)
i agree with what all of these tipsters have said and i hope you follow their advice. but whatever you do, dont try to change yourself because the man you are trying to help will still love you just the way you are. you need to come to terms with what he is doing to you and then write him a letter telling him how you really feel. he may think you ae nagging if you tell him face to face. how would he feel in your shoes?