Fan Casting Cool Old Lady in Sort by Tropes

Much like its Spear Counterpart the Cool Old Guy, the Cool Old Lady is a character that's much older than the main cast but for whatever reason, they become deeply attached to her. She can be a "hip" grandma that rollerblades, bungee jumps, can speak the teenage slang without it coming across as a Totally Radical Aging Would-Be Hipster, an Apron Matron who's gruff but caring, or a Cloudcuckoolander who is a joy to have around. Or she could be a kindly old lady who obviously led a very rich life and regales the cast with saucy stories of her escapades. The fact that she's survived doing all that and lived to that age tells you that you should Never Mess with Granny.