Husband has old man scent.....

So my husband is only 42 and I don’t consider that old. For the past year his breath and body (especially if it’s a hot day) smells like my dad. He showers daily and brush his teeth....but a swift of that scent just comes at me. During sex it’s so hard bc the smell really puts me off and I just can’t do it. I want to bring this up with him but idk how....he already struggles with confidence so that would just ruin him.