Husband doesn't want to celebrate 30th birthday

My husband is turning 30 next week and I planned a party but he told me yesterday he doesn't want a party. He is really depressed about turning 30. Main reason is my husband is a professional ballet dancer. We actually met at the ballet company he works for. I was hired through a staffing company to work at one of the vendors for a show. I had just turned 20. He was 18 almost 19. He has been with this company since he was 17 and been doing ballet since he was 3. His dad disapproved completely. Thought it would make his son gay. He's obviously not but my husband have been dancing for well over 2 decades. The problem is 30 is when they start trying to retire ballerinas and some ballet companies force you to retire by 35. Since he's turning 30 he knows the company is gonna try to retire him. He's upset because while he knew he most likely couldn't do this forever he never knew what he wanted to do outside of dancing. He loves to dance. So he doesn't want to celebrate his 30s at all. 30 is an accomplishment and I think it should be celebrated. Even if it's something small. I'm 31 and so many people see 30s as just getting older and frown upon that but I think we should embrace getting older.