Mariel is Middle-Aged??!!

In its plot outline of the film “Chatham”, which is being shown in pre-release this weekend at the Cape Cinema, IMDB refers to Mariel Hemingway’s character as a “middle-aged woman”.
I noted this with astonishment, since I still think of Ms. Hemingway as an ingenue.
Turns out, she’ll be celebrating her 46th birthday this Thanksgiving. Considering that I was not a lot older than she (49) when Bob was born, I guess our girl is entitled to be cast as a mature adult.
What is even more unsettling is the age-appropriate casting of Bruce Dern, Rip Torn and David Carradine, all of whom play 70 year olds in the film.
David Carradine attained Social Security normal retirement age almost six years ago?!
I feel like Rip Van Winkle, just waking up from a long nap.