My sister is 30 today and we were talking about evolving and emerging and becoming your own true self. And got into caterpillars not wanting to change, liking their furry bodies and not wanting to lose their fake legs. Then we thought "fake legs? are you sure? where did I get that idea?" and started to think I made it up, but no, it's true. You can read about it here... Caterpillar Anatomy
Anyway it was all a metaphor - at 29, you have no idea of the strong and amazing woman you may yet become, and the vanities of your twenties are but fake caterpillar legs to be traded for your marvellous wings!