working in a fast food place is not for a retired person, well unless they are there out of necessity, not choice like you. Its a fast paced work environment, standing for the entire shift. You are basically a cog in a human conveyor belt, repeating the same moves over and over and over. Its shift work so you would work any 5 days out of 7, you would be working weekends, evenings, early mornings, holidays etc, basically when the 9 to 5 people are not working is when you would be working. You would not be guaranteed 2 days off together.
Your hair and clothes absorb the smell of grease and food. You would need cash handling experience and customer service experience. You would need to be quick , be able to follow company specs precisely with no room for error.
If you have back or foot issues, you will be in pain from standing long hours on hard floors.
How would you anonymously donate your pay every week to a deserving employee? The company would pay you direct into your bank. You would have to pay tax. Are you going to just hand a work colleague an envelope of cash each week?? How would you decide who is deserving?? Thats just unrealistic and frankly offensive, that you would just see your work colleagues as charity cases needing to be helped by a do gooder who has more money than sense.