Oh my! My MIL was still a sock darner until the last few years and she is 91. She has a lot of whackadoodle quirks in her repertoire. She saved every plastic container that had a lid from margarine to yogurt containers. When they moved from her house to a condo we found thousands and thousands of plastic containers. She washed and reused plastic silverware, bought plastic disposable plates so they could be reused vs paper, she washed ziplock bags and aluminum foil and tin pans too. Holidays and Birthdays are a hoot cause everyone must be careful unwrapping packages since when the paper is removed from the package she scurries to snarf it up and neatly fold it for future presents. Lord help anyone that accidently ripped what she considered nice paper as she could never let it go without drawing attention to the sin of tearing perfectly good paper.
My Mom's pendulum swung the opposite way after being one of 12 kids that endured the depression and the parents lost a home. She tends to buy anything and everything, most of which she doesn't need or need the volume of from clothing, sheets, food, jewelry, coats etc. Her motto seemed to be she did without for the 20 years of her youth and she was going to make up for that forever.