David's desire was to see the examples set by others and learn from them. He knew that he would learn so much from Godly believers who did more than just "talk the talk." He wanted to follow those who "walked the talk!" He knew their lives were given to him by God so he could understand how the Godly should live.
Yes, I know the wording usually is "walk the walk," but I wanted you to see that the "talk" is what we preach. The "walk" is putting the preaching to work! "Practice what you preach." In other words, "Walk the talk!" This is why Paul encouraged Timothy, as a pastor, to set the right example for others to follow. See this in 1 Timothy 4:12.
Do you have good examples in your life? Thank God for them! If possible, encourage them with a word, or letter, or email, or text, of encouragement! Let them know you've learned so much from their lives. And ask God to use you in the same way to a younger believer. Whether you think about it or not, very likely there is already at least one person who is using you to be their example of what a Christian should be like. And don't try to say, "They should look at someone else!" You may be the only Christian they know. What kind of example are you giving them?