'Old' in the Bible

Go back, my daughters, and go on your way; I am so old now that I may not have another husband. If I said, I have hopes, if I had a husband tonight, and might have sons,

Would you keep yourselves till they were old enough? would you keep from having husbands for them? No, my daughters; but I am very sad for you that the hand of the Lord is against me.

He will be a giver of new life to you, and your comforter when you are old, for your daughter-in-law, who, in her love for you, is better than seven sons, has given birth to him.