I've done pretty much all my gymnastics as an adult--I did some rec classes as a kid, but very off-and-on and never seriously. Due to the nature of life and the lighter schedule of adult classes (you progress much more slowly at 3 hours a week, especially when the only format you can work in is open gym) skills have come more slowly than they were if I were a going 12 hours a week with a coach actually developing a training plan for me, guiding drills, etc. But just doing gymnastics is still fun, and the skills do come. I got my kip for the first time at 25, got my flyaway this past year at 34. My gym's started back up, but I'm going to be out for the foreseeable future. I'm really focused on improving overhead flexibility and active flexibility for leaps and jumps and maintaining fitness for whenever it's safe for me to go back. I'm not kidding myself about being able to hit the ground running when I get back, but I want to be as close as possible.
The range of ages, skills, and goals at adult classes have always made them really fun for me, and I was lucky enough to land at a gym that does compete adults (NAIGC). With the exception of a couple of college/grad students, pretty much the entire team is in our 30s and 40s, with a good mix of former competitive gymnasts and newbies like me. We train fewer hours than kids (most of us would struggle to fit that level of training around our jobs and families even if the gym offered it, unfortunately), listen to our bodies closely, and spend more time on soft surfaces. Everyone still has goals, everyone is still working really hard, and it's an incredibly supportive environment.