God keeps All His promises,even when you think,that you are old.
Joshua 14:10-11
And now, behold, the Lord has kept me alive, as He said, these forty-five years, ever since the Lord spoke this word to Moses while Israel wandered in the wilderness; and now, here I am this day, eighty-five years old. As yet I am as strong this day as on the day that Moses sent me; just as my strength was then, so now is my strength for war, both for going out and for coming in.

Numbers 23:19 NKJV
[19] “God is not a man, that He should lie, Nor a son of man, that He should repent. Has He said, and will He not do? Or has He spoken, and will He not make it good?

Romans 4:16-25 NKJV
[16] Therefore it is of faith that it might be according to grace, so that the promise might be sure to all the seed, not only to those who are of the law, but also to those who are of the faith of Abraham, who is the father of us all [17] (as it is written, “I have made you a father of many nations”) in the presence of Him whom he believed—God, who gives life to the dead and calls those things which do not exist as though they did; [18] who, contrary to hope, in hope believed, so that he became the father of many nations, according to what was spoken, “So shall your descendants be.” [19] And not being weak in faith, he did not consider his own body, already dead (since he was about a hundred years old), and the deadness of Sarah’s womb. [20] He did not waver at the promise of God through unbelief, but was strengthened in faith, giving glory to God, [21] and being fully convinced that what He had promised He was also able to perform. [22] And therefore “it was accounted to him for righteousness.” [23] Now it was not written for his sake alone that it was imputed to him, [24] but also for us. It shall be imputed to us who believe in Him who raised up Jesus our Lord from the dead, [25] who was delivered up because of our offenses, and was raised because of our justification.

II Corinthians 1:20-21 NKJV
[20] For all the promises of God in Him are Yes, and in Him Amen, to the glory of God through us. [21] Now He who establishes us with you in Christ and has anointed us is God,

II Timothy 2:11-13 NKJV
[11] This is a faithful saying: For if we died with Him, We shall also live with Him. [12] If we endure, We shall also reign with Him. If we deny Him, He also will deny us. [13] If we are faithless, He remains faithful; He cannot deny Himself.

Titus 1:1-3 NKJV
[1] Paul, a bondservant of God and an apostle of Jesus Christ, according to the faith of God’s elect and the acknowledgment of the truth which accords with godliness, [2] in hope of eternal life which God, who cannot lie, promised before time began, [3] but has in due time manifested His word through preaching, which was committed to me according to the commandment of God our Savior;

Jude 1:24-25 NKJV
[24] Now to Him who is able to keep you from stumbling, And to present you faultless Before the presence of His glory with exceeding joy, [25] To God our Savior, Who alone is wise, Be glory and majesty, Dominion and power, Both now and forever. Amen.