Genesis 24:1

And Abraham was old with days, and the Word of the Lord had blessed Abraham with every kind of blessing.

AND ABRAHAM WAS OLD, WELL STRICKEN IN AGE. Scripture reiterates [Abraham’s old age although it has already mentioned it] in order to inform us of the reason that he adjured his servant. Thus Scripture says that because Abraham saw himself to be very old and he thought that if he will send the servant to the land of his origin, perhaps before the messenger would return, he will have gone to his long home, he therefore adjured his servant — whose counsel Isaac would follow since he ruled over all that he had — that he should not take for him a wife from the daughters of Canaan.
In Bereshith Rabbah, the Rabbis said: “Here. it was old age combined with vitality; further on it was old age without vitality.” By this the Rabbis wanted to explain that ba’im [literally: “coming” in days — mentioned above] — means the beginning of the days of old age, as the word ba’im indicates the present, just as, ‘Haba’im’ (those that come) in at these gates. But here it says that he was very old for already he was ba bayamim [literally: “he had come in days” — past tense], just as: Thy brother ‘ba’ (came) with subtlety.

1 He was advanced in years. This is to say, the time had come to marry off his son during his lifetime.

2. And God blessed Abraham [with everything] - this is to inform/explain to us about what is said in [the text in] front of us, that Abraham did not send his servant to take a wife [for Isaac] on account of lack of women in the Land of Canaan or because no one wanted to mate with him, because Abraham had been blessed with everything and the entire world desired to mate with Isaac, but because he only wanted a spouse for Isaac from his family. This is why Abraham's servant said: "And Adonai blessed my master very much and he has become wealthy." And it is for this reason that the text needed to explain first that God had blessed Abraham "with everything," as in a similar instance: "And Ham was the father of Canaan" (Genesis 9:18).

ואברהם זקן..וה' ברך את אברהם, the Torah now explains the reasons why Avraham was forced to dispatch his servant to another country in order to secure a wife for his son, and why he had to subject his trusted servant to swearing an oath to him concerning this mission. He was worried that he might die before Yitzchok would find a suitable wife, seeing that he already felt the signs of old age overtaking him. He was worried that he might not live long enough to attend the wedding of his son. He therefore decided not to delay the matter any further. At the same time, due to his extreme material wealth, he was worried that some unworthy person (father of a marriageable girl) would try and bribe his servant into committing his daughter to become Yitzchok’s wife. As a result of the bribe Eliezer would not allow his judgment as to who was a suitable bride to guide him. This is why Avraham made his instructions subject to acceptance with an oath.

ואברהם זקן, this is either past tense of the verb, or an adjective;

בא בימים, the years when man thinks about his departure from this earth and is concerned to make sure that his son or children are safely married while he is still around.

וה' ברך את אברהם בכל, he lacked nothing, and did not need anything in this life except to see his son well married.

ברך את אברהם בכל, “He blessed Avraham in all respects.” This was due to the merit he had acquired when tithing the loot of the war against the Kings with Kedorleomer and giving it to the “priest,” who was the King of Shalem. (Genesis 14,20)