If we look for the purpose of life in ourselves, we will only find emptiness. Only in faithfulness and obedience to Christ can we find fulfillment. The Bible gives us the all that we need to know to find joy, peace and purpose.
In Titus, the Bible gives clear instruction for older adults:
Teach the older men to be temperate, worthy of respect, self-controlled, and sound in faith, in love and in endurance.
Likewise, teach the older women to be reverent in the way they live, not to be slanderers or addicted to much wine, but to teach what is good. Then they can train the younger women to love their husbands and children, to be self-controlled and pure, to be busy at home, to be kind, and to be subject to their husbands, so that no one will malign the word of God.
Titus 2:2-5 NIV