30 wasn't hard for me-I had other things on my mind--my son was born exactly 3 weeks before my 30th birthday..and then 6 days after he was born 9/11 happened, so between worrying about that and dealing with a newborn and a not quite 2 year old, turning 30 was the last thing on my mind. LOL
Though truthfully it didn't bother me when I thought about it as I hit my late twenties. I was exactly where I wanted to be at 30-great husband, 2 wonderful kids, a nice home, etc.
Now 40--I am dreading it already and I still have 6 plus years to go.