Either of those characters are complex, real women. So, Jenny's age wouldn't be a problem, because neither or those characters really trades on sex appeal, but Jenny could bring that dimension to those characters if she wanted. One of my favorite J.Lo movies is Out of Sight, with George Clooney. Jenny plays a US Marshall. It was probably her best role.
Wait, why had I never even thought of this before?
I think she'd be a great fit in a superhero movie. She's got the look and the acting chops. I'd definitely check it out, and I'm not even a real fan of the genre.