how does she look so much like Kendall Jenner?

how come 2 times recently when i've glanced at a pic of sandra on the cover of a tabloid magazine my first thought was that's Kendall Jenner? and then a second later, only when I look more carefully at the pic do I realize it's Sandra Bullock? how do they look so much alike? and how do they look so much alike when Sandra is old enough to be Kendall's grandmother almost?