The expression "full of days" can be also be rendered "full of years". For instance Genesis 25:8 says, "Then Abraham gave up the ghost, and died in a good old age, an old man, and full of years; and was gathered to his people". Full of years refers to the quality of the life they lived. It is not about the number of years you live but the fulfilment of what God wanted you to do in the years you live. It is substantiated with the accomplishment of God's purpose in your life. It is called living God's dream. 1 Chronicles 23:1 bears a wonderful testimony of David the king of Israel, "So when David was old and full of days, he made Solomon his son king over Israel". This is what is called living completely or to the full. That's what God wants for your life, doing His will with the quality He demands.

Have you discovered God's purpose for your life and have you aligned yourself in the fulfillment of that purpose? Nothing else will ever satisfy you until you find yourself doing what God designed you to be doing, living the purpose of God for your life. Acts 13:25 renders a testimonial of John the Baptist, "And as John fulfilled his course". That means John fulfilled the purpose of God for his life and remember he was executed when he was about 32 years old. So you can see it is not about the number of years but the fulfilment of purpose in those years. Don't think you are too young or too old to discover and fulfil God's dream for your life. At the age of 33, Jesus said "it is finished", accomplishing God's will (John 19:30). He consummated salvation for mankind.

Spend your life on earth pleasing the Lord Jesus by doing what He wants you to do. That is how to be full of years.