Andrew wasn't lying, Sansa is a very beautiful woman, even superior to Zany in some ways, but it seemed that she was sensitive to the issue, so he decided not to continue bothering her.
In this world, strength is vitality, therefore, the stronger you are, the more years of life you will have and consequently your youth will be maintained. It is for this reason that Bita and the other old women, despite being over 1,000 years old, only looked like they were 80 years old.
Sansa was similar. Although Andrew didn't know how old she is, since it's taboo to ask women that, he believed that she wasn't very different in age from Oliver, so she should be in her 40s. Even so, she looked like she was in her 20s, that beautiful and preserved she is.
Unfortunately, there are many people who care more about age than what they look like, especially women and Sansa seemed to belong to this group.
