It felt normal. It was a constant background chatter in my mind but nothing extraordinary happened on the day I turned 30. There was a quite celebration at home and some rumination on my part but by and large, it was like any other birthday I have had.
Although, to be honest, turning 30 has induced some changes. But these changes had been in the making for some months before I turned 30 actually. I feel grown up.
The most important difference that I have noticed is that of a lack of an urgency. Earlier, everything was urgent for me. I had to urgently achieve something, urgently be somewhere or fulfill a goal. Now, I have perspective. Some things are still urgent, like caring for parents but self related goals are not that urgent anymore. I have more patience and I have a long term outlook on life. If there is something I want and it happens, then good. I will be okay otherwise too.