Could care less about her age. Its more of the age difference between her and Cavill (what? 9 years??)
This comment made me think of something: How come it is acceptable in our society in movies for men to be much, much older than women, but the reverse is bad, especially if the actors cast don't look their age? Adams might be 37, but does she really look 37? Speaking from personal experience, I am always surprised at how old she actually is considering that she still looks like she is in her early 30s at most.
It is also worth noting that many times, actors don't play their real ages in films. Wasn't Tom Welling and Kristen Bell something like 25 when cast as 15 year olds?