I'm a woman turning 30 in a few days?

Okay, so what are the 30's like? I've noticed some changes the last couple of years. I've become more comfortable in my own skin and could care less about people's opinions. What are the 30's like or have been like for some of you? I've heard men jokingly say they physically start to fall apart. Women start to gain weight. Did anyone feel different then in their 20's?