2 Corinthians 5:1

For we know that if our earthly house, this tent, is destroyed, we have a building from God, a house not made with hands, eternal in the heavens.  

As believers, we know and trust that we will live in eternity.  That even as we age, we have a greater future in heaven. God has made us a house, and when we finish our purpose here, we will continue it in heaven.