One generation shall commend your works to another, and shall declare your mighty acts. (Psalm 145:4 ESV)
In a day and age when we'd rather do things with people who are similar in age and stage of life, we are reminded here that we are to commend God's words and works to other generations. This is a two-way street, not one way from the older generation to the younger generation. While it may be true that an older generation has more wisdom to offer the younger; it's not true that younger generation has nothing to teach the older.
What the younger generation can teach the older
The younger generation can teach and remind the older generation what child-like faith looks like. As we get older we get cynical about the idea of trust. We need to be reminded by the younger generation the words of Jesus:
And calling to him a child, he put him in the midst of them and said, “Truly, I say to you, unless you turn and become like children, you will never enter the kingdom of heaven. (Matthew 18:2-3 ESV)
A child-like faith is dependent on God for everything. A child-like faith trusts Him completely. A child-like faith is humble.
What the older generation can teach the younger
The younger generation needs the older to show what maturity and wisdom look like.
Him we proclaim, warning everyone and teaching everyone with all wisdom, that we may present everyone mature in Christ. (Colossians 1:28 ESV)
Without maturity, child-like faith can become childish faith.
Mature faith isn't rattled by circumstance. Mature faith expects suffering and knows how to deal with it. Mature faith continues to grow, especially through service.