I'm not a senior, but I am frugal and love to learn from my elders, so I picked this up from the library to peruse.
I haven't tried any of these tips yet, but these were fun and original!
1. Keep grapes fresh longer by pouring orange juice over them.
2. Revive stale crackers by spreading them on a baking sheet and heating in a 300 degree oven for 5 minutes. Once they cool you can store them in an air tight container.
3. Use your shower water to heat your home in cold weather. Instead of letting your hot water run down the drain, plug it up when you are showering and only drain once it has completely cooled. This must also help with humidity in the dry winter months!
4. Clean your chimney with salt. Throw a handful of salt (sodium chloride) in the fire. Salt combined with the water released from the wood forms an acid that can help dissolve light creosote.
DO NOT ATTEMPT WITH METAL CHIMNEYS.
This one makes me nervous, so please check with a professional before giving it a go.
Do you have a favorite book that teaches something about frugality?