What are some concrete things that the elderly can still do to not only live out their faith, but also to show the next generation what their faith means to them?

Similarly, encourage the young men to be self-controlled. In everything set them an example by doing what is good. In your teaching show integrity, seriousness and soundness of speech that cannot be condemned, so that those who oppose you may be ashamed because they have nothing bad to say about us. (Titus 2:6-8)
When Joshua was old and well advanced in years, the Lord said to him, “You are very old and there are still very large areas of land to be taken over.” (Joshua 13:1 – followed by several chapters in which he coordinates the division of the land among the 12 tribes)
After a long time had passed and the Lord had given Israel rest from all their enemies around them, Joshua, by then old and well advanced in years, summoned all Israel – their elders, leaders, judges, and officials – and said to them: “I am old and well advanced in years. You yourselves have seen everything the Lord your God has done to all these nations for your sake; it was the Lord your God who fought for you….Be very strong; be careful to obey all that is written in the Book of the Law of Moses, without turning to the right or to the left…. (Joshua 23:1-3; 6)
In these verses, we are reminded that no matter how old we are, we still have responsibilities in the Lord’s work. Paul gives Titus instructions about how to be an example in one’s teaching, speech, etc. In Joshua, we find that, despite the fact Joshua was old, the Lord still had concrete things for him to accomplish regarding the land of Canaan. Joshua ends with words of hope and words of warning: remain faithful or the Lord will reject them. Joshua died with integrity, and he had been an example of one who was faithful to God and he knew he had had a purpose for his life.
With this in mind, consider the following questions.
Consider some examples of how one can “show integrity, seriousness, and soundness of speech” as one ages.
What are some concrete things that the elderly can still do to not only live out their faith, but also to show the next generation what their faith means to them?