I usually just smile or say Thank You. It depends on the person. But when they compliment me by saying that I look alot younger than I am, I usually just smile, because I never know if it's a good thing or a bad thing.
Press today is so concerned with cool vs. not cool that they're starting to forget good vs. bad. I'm not sure I'll ever be "cool", but I will always tirelessly strive to be "great". - Josh Groban
I tell my students to be sure to say "Thank You" and then remember, that the compliment was for something that they are good at, or something good that they did. Remember what it was, it is unique to them, and to keep on doing it, doing good things will help anyone to go far in life.
I always say "Thank You" as well when complimented.
I will tell you this - sometimes I get compliments on things that I am not comfortable accepting compliments for - maybe because I am unsure of it.
For instance, I work out a lot (not too much now, with chemo) but generally speaking, I do. From what I have been told, I look pretty good, but for many many years, I was quite heavy and overweight - it was a battle getting to where I am now - and I actually enjoy weightlifting - it feels good. I forget about the way I look and then someone says "David, you look great - do you compete?"
I laugh to myself when I hear things like that - I think that they are making fun of me when it's said - I certainly don't see that 'competition trait' in how I look and it's embarrassing.
So, for all of those that get embarrassed by certain compliments - I know how you feel.