Unlike everything and everyone else that grows old with age, God is the same forever; He doesn't age. He will not grow older tomorrow, neither will He become weaker next year. He doesn't even dwell in time, He dwells in eternity. He created time but He's not bound with time.
He does not change. Though Jesus came into this world through the virgin Mary about two thousand years after Abraham was born, yet He is the creator. He laid the foundation of the world and made the Heavens. This means He has been in existence before the earth and the Heavens were created and will still be after everything and everyone is gone. The never-changing nature of God assures us that all His promises concerning us are yea and amen. It doesn't matter how long ago God made a promise to you; just hold on to it, He will bring it to pass. God can't lie. Hold on to Gods word concerning you. It may appear time is running out, but never give room to doubt. It will not tarry, His time is not yours.