Too Old for a Shorts Suit?

Sheila E and Michelle Williams face off in red carpet shorts.

 Despite a 20+ year age difference, both Michelle Williams and Sheila E both opted for a shorts suit on the red carpet. Is there an age limit for this look?

 Most recently, 31-year-old Michelle Williams showed her buttoned-up version of the boyish short shorts at the Independent Spirit Awards.

But earlier in the month, 54-year-old Shiela E showed off her legs in a white shorts suit at the Grammy awards.
So who wore it better?
Granted, both celebs were going for an entirely different look: Michelle Williams played off her gamine appeal with a tomboyish, minimalist take on the shorts suit. While Sheila E went with an all-white version that was definitely on the glam side.
Both Michelle Williams and Sheila E have the legs to pull it off.
So the question:, Is there an age limit on when you can successfully wear a shorts suit on the red carpet without looking like you are trying to hard?