Why do most people find it weird if women date younger men but it's normal if men date younger women?

Left: Aaron Taylor Johnson (the actor who played Quicksilver in Marvel) and his wife Sam Taylor Johnson (filmmaker)

Right: David Foster (musician) and his wife Katherine McPhee (musician)

Hollywood actors date younger women with big age gaps. For example Jake Gyllenhaal, Leonardo DiCaprio, Johnny Depp.
Why do most people find it weird if women date younger men but its normal if men date younger women?
Why do most people find it weird if women date younger men but it's normal if men date younger women?
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