how do I tell him I can't stand his BO? 🤢

Aggie
I love my daddy, but he's 75 & as most old folks, he has a distinctive smell. He usually takes showers every Sunday morning and washes in his bathroom sink in between. But this past Sunday, I think he forgot to take a shower. I'm not sure if he's waiting for another Sunday to wash up fully or what, but the past 2 days I couldn't stand his BO cause it's making me nauseous! 🤢
How do I tell him he needs to take a shower 🚿 without hurting his feelings? 😕