My husband and I are filing separately, with one schedule C each. Can we split our family health premium between our two schedule C's?

I'm older than my husband, so the premium isn't really 50-50. About 60% is for my insurance, and 40% for his. If we each claim part of it as a business expense, do we have to claim exactly the amount that applies to each of us, or can we just split it 50-50?