If you have no family members to support you, you will have spent most of your life as an addict gaming the social welfare system, so you have barely worked, which means when you “retire” your Social Security is about $700/month, and that’s it for your income.
You have no pension, no 401(k), nothing else. This means you also qualify for food stamps, and Medicare, so your food and medical are somewhat covered.
Your income will be “too low” to qualify for a lot of senior housing, so you will wait on the waitlist for a while for the place you do qualify for, where your rent will be about $200/month.