Grandpa and aunt came to dinner to talk about this.

Grandpa Zhang is 70 years old this year, but he is healthy. He insists on the habit of "going to bed early and getting up early". He runs for half an hour every day. He often washes his hands when he gets home. He opened the window of the room to breathe fresh air. More importantly, he does housework by himself. All these contribute to his health.