here they are:
1. a decent piece of furniture :a piece of furniture that was not bought off gumtree or handed down by some relative. as you leave the "student" lifestyle and begin building your own home, it is important that you own something that is apart of you.
2. a small circle of friends you can trust with anything : by the time 30 is here, you have figured out who you are and have witnessed first hand who your true and close friends are.
3. the knowledge of whether you want to have children or not : this is important in general. no further explanation needed.
4. something impractical and expensive that you bought yourself just because you wanted it : i think we all know what i mean here. you deserve that designer handbag or those Prada shoes that you have always admired but never owned. if you heading for 30, then you better act quick (or eveb Christian Louboutin red sole shoes are an option too!)