"I will make you a great nation; I will bless you and make your name great; and you shall be a blessing. I will bless those who bless you, and I will curse him who curses you; and in you all the families of the earth shall be blessed" (Genesis 12:2-3)
From the Bible, we see that even at an old age, Abraham was very rich because God blessed him in all things. He was rich in cattle, in silver, and in gold (Genesis 13:2). The word translated "cattle" is actually "livestock"-- he had herds of cattle, sheep, goats, etc.
Then in Genesis 24, we read something beautiful about Abraham:
"And Abraham was old, and well stricken in age: and the Lord had blessed Abraham in all things."
Abraham's life progressed from glory to glory, there weren't any downs. This is God's plan for your life: upward and forward only. He doesn't want a situation where, somewhere along the course of your life, you'll be regarded as one who used to be rich-- He's ordained your prosperity to go on for eternity!
You're God's just and righteous one, and Proverbs 4:18 is the story of the way the life of a Christian goes:
"...the path of the just is as the shining light, that shineth more and more unto the perfect day."
Just because you're retired doesn't mean you should go broke.
"So then they which be of faith are blessed with faithful Abraham"
You're blessed with faithful Abraham, and there will be no end to the increase of your wealth and prosperity! Blessed be God!
I'm an heir of God and a joint-heir with Christ-- the world belongs to me! I'm the seed of Abraham; therefore, I'm blessed with faithful Abraham. I'm blessed with the dew of Heaven, with the best of the earth, and with plenty to eat and drink. My prosperity is endless!
Further Study: Genesis 26:12-14; Psalm 1:1-3