The accumulation of knowledge, experience, and contemplation is referred to as a quality that is contributed to by aging.

The accumulation of knowledge, experience, and contemplation is referred to as WISDOM. It is the ability to judge, think, act, use knowledge, understanding, and is regarded as one of the four cardinal virtues. It increases with age, and requires control of emotions.

The accumulation of knowledge, experience, and contemplation is referred to as WISDOM, a quality that is contributed to by aging.
As people got older, they will face a lot of problems throughout their life. From this experience, they might acquire some things/consideration that could be useful for the younger people so they may avoid making the same mistake as the older generation did. 

6, 4, 5, 1 are true. the others are false.