Modern cinema is beginning to move past the "sad widow" or "feeble grandmother" stereotypes, though progress is uneven: Women Over 50: The Right to be Seen on Screen
Historically, Hollywood has prioritized youth for female actors, with many experiencing a career "peak" around age 30, while their male counterparts often peak 15 years later.
Here's a sample draft write-up that approaches the topic with a focus on general information: