Mouse-over headshot to see an actor "as they appeared back then"

I'd love to see a feature added where, when available, hovering the mouse over an actor changed from their current headshot to a photo of them from the period the film was made. So if you're looking at Back To The Future, you could hover over 63 year old Michael J Fox and see him as he looked at ~25.  

In addition to being really neat, it would help me identify characters and actors in films where I'm a bit fuzzy on the names. It sounds niche, but I feel like I run into this quite a lot.