Is it impolite for an old man to give his food to a child?

From the perspective of the elderly, they think it is love for their grandchildren, because the elderly have raised you like this since childhood, but it is not recommended to do so. After all, children's physical resistance is low, and old people are prone to get sick when they are old. Giving children their own food often may lead to illness.

From the perspective of young people, I certainly don't want the old people to give their children food. The mouth is easy to breed bacteria, leading to the spread of viruses, and children have poor resistance and are prone to illness.