Yeah, I'm kinda iffy on this one. Like you, I'm 33 (going to be 34 in a couple of weeks) and really could give a rat's ass about what I wear, how I look in it, and don't care who is looking at me and what their opinion is. I am very comfortable with who I am, and how I look, and if you don't like it, that's your problem, because it is certainly not a problem with me.
Having said that, I hang out with quite a few people who are younger than me, and it does make a difference in the kind of conversations that we have, where we go when I hang out with them, and why clothing becomes an issue, not just a necessity against the elements. Again, it's not a big deal, I have just as much fun with them as I do with other people who are my age and older, but there is certainly a bit of a division in terms of maturity and recognition. I am really reminded of my age, when I talk about something in my past, and find out that most people can't identify, because they were just in kindergarden when I was a teen.