וְאַבְרָהָ֤ם וְשָׂרָה֙ זְקֵנִ֔ים בָּאִ֖ים בַּיָּמִ֑ים חָדַל֙ לִהְי֣וֹת לְשָׂרָ֔ה אֹ֖רַח כַּנָּשִֽׁים׃
Now Abraham and Sarah were old, and well stricken in age; it had ceased to be with Sarah after the manner of women.—
Read kabbalistic (mystical) interpretation of Genesis 18:11: and classical mystical sources.