How are four-character idioms formed?

Men, women and children generally refer to all those who help the elderly and bring up the young: pull. Help the elderly and lead the children. The argot of the word "wonderful" refers to a young woman with yellow curls. Respect the old and love the young: respect; Kindness: love. Respect the elderly and care for children. There is a saying that seniority refers to the priority between the old and the young. Also known as "orderly". Generation refers to the size and status of generation. Take care of the old and promote the young. Old with small, old with small. Describe the tragic scene of everyone being driven out and displaced. The argot of the word "Miao" of yellow silk girl. Raising children to prevent old age is the same as "supporting the old and taking care of the young". Young people learned to be strong and diligent when they were young, and they were rewarded when they were young. Orderliness [explanation] refers to the priority of the elderly and the young. The same as "the old and the young each have a memory." Love for the old and kindness for the young: kindness. Take care of the elderly and children