Writing-wise, I certainly have evolved my style over time. Reading old prose is a little silly and almost embarrassing, except I know I would never be where I am today if I didn't start writing those pieces all those years ago! I would say I do a lot better with planning out stories, describing environments and actions (though I still have room to improve!), and generally developing a character through actions. I also think I've picked up a distinct style in which thoughts and actions of a character can blur and cross-over in a narrative, and I'm really happy to continue working with that unique style.
As far as just character development goes, I definitely notice my preferences and interests have changed! My characters have definitely aged to an extent with me; I no longer really have a desire to develop or write about teenage individuals, as their life experiences are not as interesting to me anymore. I work with adult characters in their early to late 20s, and while I don't imagine that's going to change (I'm not continuously aging my characters with me anymore), I definitely think that as I mature as a person, so too do the issues that are important to my characters.
I'm a lot more comfortable thinking about sexuality of my characters than I used to be, and with that comes considering the sex life and experiences of my characters, which lends a lot to their development as people. I used to be sort of embarrassed about it, but now I'm not. With that, of course, is why I don't like working with younger characters as much anymore.
Another aspect I've noticed I enjoy is that while initial love stories are always something I love to write, I also really enjoy developing the established/long-term relationships many of my characters have with each other nowadays. Whether it's their relationship several months or years into dating, or detailing marriage and being parents, I think those are much more interesting scenarios to me than they were when I was younger.
Finally, I definitely notice my tastes in character aesthetics have changed as I've grown as a person and as a creator. I may like facial hair on my male characters a LOT more now than I did when I was a teenager. xD (I wouldn't even have entertained the thought back then when designing characters!) I also am a lot less interested in my anthro characters than I used to be. I still love them, but I am definitely much more invested in my humanoid characters lately.
Those are just a few things I've noticed about my creations as years have gone by. I honestly am super happy I've had my characters for so long and have been actively working (on and off) with them for such an extended period of time--they can only get more nuanced the longer I spend time with them. I also feel that they continue to grow and surprise me! ^^