it's true that for everybody your lips do flatten and become thinner over time. some people never have big lips and so they will notice it more and maybe at an earlier age. injections are one of the main ways to add volume back but for people who don't want volume that way there are some lip liners that you can use and some lip plumpers that help a little bit. most of these work by causing some irritation that increases blood supply that gives a temporary effect of fullness. for some people that works fine and otherwise it can be irritating. so there isn't that much that you can do. but you might be able to just work with a good lip gloss or a lip liner to add the appearance of volume. the other thing to think about is your teeth because your teeth is what supports your lip. if your teeth are in or pointing in or if you lose volume in terms of bone around the mouth that can also cause your lip to flatten and look thinner over time. so just getting something as simple as veneers can help invert your lip and give you great support of your lips and make a very big difference without doing any injections at all.
my lips seemed to be thinning as i get older. i don't want injections. are there other options for me?