Helena Bonham CarterToday's A-listers are versatile chameleons who convince audiences they can inhabit the lives of just about anyone in any context. What they can't do as convincingly is portray characters whose ages differ widely from their own.

Age might not be anything but a number, according to R&B singer Aaliyah, but it is important in establishing realism.

Still, a lot of recent casting announcements seem to be placing familiar actors in roles that don't seem age-appropriate.

Sure, as audiences, we can suspend our disbelief, but that willingness may be stretched to the breaking point in some of these upcoming films.

Here are a few of them, from the "How Will This Work?" file.
The Great Gatsby
PG-132013
Based on 45 critics

In 1922 New York, a would-be writer moves next-door to a mysterious millionaire (Leonardo DiCaprio). Read More

An Education
PG-132009
Based on 34 critics

In 1960s London a teen (Carey Mulligan) falls under the spell of a charming, but much older, suitor. Read More