Now Abraham and Sarah were old, advanced in years. The way of women had ceased to be with Sarah.
11. Were old, and well stricken in age Moses inserts this verse to inform us that what the angel was saying, justly appeared improbable to Sarah. For it is contrary to nature that children should be promised to decrepit old men.
These heavenly guests (being sent to confirm the promise lately made to Abraham, that he should have a son by Sarah), while they are receiving Abraham's kind entertainment, they return his kindness. He receives angels, and has angels' rewards, a gracious message from heaven, Mat 10:41. I. Care is taken that Sarah should be within hearing.
Commenting on Genesis 18:9-15
Now Abraham and Sarah were old, and well stricken in age,.... The one being ninety nine years of age, and the other eighty nine; and which is observed to make it the more surprising that they should have a son at such an age; and what follows still makes it more so: and it ceased to be with Sarah after the manner of women; her...