For then the dust will return to the earth, and the spirit will return to God who gave it.

Ecclesiastes 12:7

Warren Wiersbe: What are your days like at this stage of life?
(With the Word: The Chapter-By-Chapter Bible Handbook)

Days of decline. (Ecclesiastes 12:1-8)

• Make the most of all the opportunities you are given before you become too old to have all the opportunities. 

Days of learning. (Ecclesiastes 12:9-12)

• Never stop learning, no matter how old you are. You are never too old to learn something new.

Days of obedience. (Ecclesiastes 13-14)

• Fear God and obey His commands. You never age out of these two things.

Living days making the most of opportunities, learning, and obedience are important at any stage of life. It’s never too late to live days like this. 

•  So teach us to number our days that we may get a heart of wisdom.
  Psalm 90:12 (ESV)
• Remember how short my time is! For what vanity you have created all the children of man!
  Psalm 89:47 (ESV)
• Man is like a breath; his days are like a passing shadow.
  Psalm 144:4 (ESV)
• Yet you do not know what tomorrow will bring. What is your life? For you are a mist that appears for a little time and then vanishes.
  James 4:14 (ESV)

and followed the counsel of his younger advisers. He told the people, “My father laid heavy burdens on you, but I’m going to make them even heavier! My father beat you with whips, but I will beat you with scorpions!
1 Kings 12:14

God warned the Israelites of this in 1 Samuel 8:10-19.

Make the most of every day.