If someone says you look great for your age chances are there was no malice intended, the only malice is in your perception not in the speaker's intentions. Haven't you ever been misunderstood, and somewhat shocked at the listener's interpretation of what you thought were benign words?

You think you will be happier when people stop being 'insensitive' but people will always say things which you find are 'insensitive' to you way of thinking, because only YOU have your way of thinking. You'll only be happier when you stop focusing on the insensitivity and accept that not everyone has the same sense of motivation or even semantics as you. You're clearly mindful of your age, let it go and allow yourself to be "hot for 55" without needing to be anything else. It's still a lovely compliment! And if that photo up there is of you......hullo Daddy!