I had a 60 year old teacher who decided to get braces. It worked, slowly but fine. She was extremelly happy in the end. Also, personally (maybe because I am a dentist) I prefer people with good teeth when dating, I also value men who take care of themselves. Good teeth alsoo improve breathe because plaque doesn't have such an easy time accomulating and it can slightly change your face/smile to something either "a little bit better" to "wow, it's a way better version of myself!" I studied several cases in college of people who were average to ugly, and when they got braces, they would get average to good looking, a couple of them improved so much they could become models! Of course they only showed us the brightest of their results but it's no lie that it can change your lips and smile for the best! And to your case, it might make you look slightly younger, if that is something you would also want. If you dont feel like you need that yet (after all I'm comparing you in my head to my heavily smoking aunt) you will be thankful in the future! I would totally get braces if I were you. Also I'm 25 and I'm getting my own braces soon! Gotta embrace life and live it to the fullest, so we have no regrets!