How did it feel? No different to 29.
Personally, I found turning 21 far more traumatic than 30. It was like OMG, I'm supposed to be an adult now, and I didn't know how to handle that! Or maybe I just gave myself enough time to get used to the idea of turning 30 ie. convince myself I wasn't bothered by it.
The scary part, now pay attention here, is just how quickly 31 creeps up on you. Then you start to feel like you're not just out of your 20's anymore, you're heading for 40!
I was talking to my sister a couple of months ago about a friend of hers who was having a birthday, and I said, "so you'll also be 32 in August" and she said "no, 33"! Which, horror of horrors, means
I must be turning 32 this year! How the heck did that happen??
That is what you need to watch out for. Them years are sneaky the way they creep up on you!
