My mom is 80 and refuses to consider anything as risky as t-bills. She has about 200K and income including interest of about 30K. With no house payment and low income senior discount on property taxes she lives as well as she wants. She got a new car 3 years ago but should quit driving soon. Her hips hurt she doesn't feel up to going shopping or traveling. If she outlives her money I will give her some. I buy her things she wouldn't waste the money on like a LCD tv when her 19 inch or less old TV wouldn't pay DVDs so she has to use a tiny tv meaning two tvs next to each other. She didn't need a big tv but a 24 in LCD wasn't too big and she could toss the two old analog tvs. Her big financial treat is a new restaurant that has $9 taco salads that are huge, she has gone 3 times already.
Sometimes it isn't about the money, leave her alone to not worry and if she down to eating ramen remember grocery stores have gift certificates and mothers day, her birthday and Christmas are coming.