http://helpmewithbiblestudy.org/5system_moses/print/dh11AbrahamHalfTruthWifeSister.pdf
In the sojourn to Egypt (Gen 12), Sarah was about 65 years old and was considered very beautiful. In the sojourn to Gerar (Gen 20), Sarah was about 90 years old. The Bible does not reveal why Abimelech desired Sarah’s inclusion into his harem, and destructive critics do not find it credible that a Philistine king would romantica lly desire an old woman. However, by human standards, it is also dif ficult to understand Sarah’s stunning beauty at age 65 and how she could be pregnant at age 90; thus, the possibil ity of Abimelech’s attraction to her beauty cannot be ruled out. Furthermore, as Sarah was in the company of one of the richest and influential men in the region, Abim elech may have had a political motive.
Okay, Sarah is 65 years old. She may be a beauty queen in high school but 65? That's when she met Pharaoh. Then she's 90 when she met Abimelech.
Do these years truly mean "months". So maybe meaning of words years and months in ancient Hebrew have changed?
Do people remain sexy for much longer time in ancient time? Can this be scientifically valid?
Any reasonable reason?