I hate it when people say "something is the new something." You know — gray is the new black (or something equally insipid). However, I can't help but agree that 30 really seems to be the new 20. As a woman in my 20s, I'm a little discouraged by the stupid things some of my peers still think is OK. It's time to step it up and start acting like adults. This is getting embarrassing.
This is your time. Use it to develop your sense of self, free from what others expect of you. Examine your beliefs about relationships, children, religion and your career. You can't move on to the next phase of your life unless you're willing to leave the "younger years" behind. This is your chance to find out what being an adult looks like for you — and you alone.
I love this phase in my life. I felt like I got to start over once I was away from all my high school and college friends. This is the perfect time for us to reinvent ourselves as strong, capable adults — not hide in our parents' basements doing the same things we've done since we were 16. Your mid-20s are awesome. Don't waste them.