Are the years catching up to you? When I entered mid-life, I began to understand a bit of what the expression, “Mid-life Crisis” meant. There was a creeping sense that there were probably less days ahead of me than behind me, that time was running out, and that if I was going to do anything important with my life I had better get to it. People who have mid-life crisis evaluate their lives and often do not like what they see and make abrupt changes to either capture a sense of youth or refocus on a goal before it is too late to achieve it. 
The author of Psalm 71 was well aware that his life was in God’s hands from birth all way through his senior years. “Upon you I have leaned from before my birth,” he wrote in verse 8. Facing enemies yet again but now looking at old age he prays to the Lord, “Do not cast me off in the time of old age; forsake me not when my strength is spent” (verse 9). Repeatedly, he speaks of praising God and testifying that God has been faithful to him. The psalmist has plenty of things to testify about when he thinks of God’s wonderful acts: “their number is past my knowledge” (verse 15). But the verse that stands out to me every time I read the Psalm is number 18. There, the psalmist pleads with God to help him so that he can accomplish a task that is dear to his soul. He writes, “So even to old age and gray hairs, O God, do not forsake me, until I proclaim your might to another generation.” 
Do you see it? His desire is to live a bit longer, to be delivered from his enemies one more time, so that he has opportunity to pass on the stories of his God to younger people. His burning desire is that they hear and know of the God who has been with him his entire life, to share his testimony of faith so that young people might know his God. He loves the Lord and wants others to come to know and love him, too. 
Are you at the “old age and gray hairs” stage of life? One of the most important things you can do is communicate passionately and repeatedly your own stories of God’s faithfulness to younger people. Your kids and grandkids should hear your testimonies enough times that they can recite them well when you are gone. The young people in your church and life should know some of your stories about the Lord because your burning desire is “proclaim your [the Lord’s] might to another generation.” So, speak those stories, repeat those stories, record them in a journal or in videos. One way or another, point others to the Lord with the stories of what he has done for you. Leave behind your testimonies before you are no longer present to give them.