J.S.
I like Dr. Mary's advice.
My husband is turning 50 this year and is fine about it. I'm going to throw him a big party as well. Make it fun.
As for your husband, I would ask him some serious questions about why he's flipping out about turning 30. Maybe it is an age thing (my youth is gone), but maybe it's something deeper. Maybe he has some dreams that he thought he'd achieve by the time he was 30. Maybe he's not where he thought he would be career-wise.
This is not a big deal for you, but it is for your husband. Show a little sympathy, but I don't think I'd put up with him wallowing in self pity either. I'm sure you both could come up with a plan of action (maybe he should go back to school or jump out of that plane like he wants) and help him get over his 30 phobia. I agree with the other poster that said you wouldn't be too keen to hear "get over it" if something out of your control was bothering you.
Good Luck!