This was me until the last couple of years (near 40). Now wear size 8 instead of 6, have a wrinkly neck and frown lines 😔 I’m also trying to dress more maturely, with mixed results.
In general I think most women don’t change much between early 20s to mid 30s. Men tend to change much more in this age range - hair loss and weight gain. Then women catch up in our 40s.