There shouldn't be rules about who can and cannot live with a drastically extended (potentially unlimited) lifespan. However, the practicality is that some aspects of our society will have to change based on the resources available to humanity on Earth.
For example, as the population increases and we approach the limits for how many people can be supported under the current system of food/energy production, rules around procreation will spring up. You will likely have to apply for (and be approved) to have a child of your own. And if approved, you will likely be placed on a list where you will receive notification when enough people have died from unexpected causes to free up a "spot" for your child. How to enforce that, you ask. It is likely that men and/or women would be sterilized at birth. The procedure would likely be reversible, but if not, you would just use a combination of your DNA and your spouses (and possibly others) to fertilize an egg.
Marriage would likely turn into a contract with a finite term (10 or 20 years) that had optional renewal periods. Otherwise, the divorce rate would approach 100% after say 100 years. 
Standard diets would likely change to be more (or almost entirely) vegetable based. It takes a lot of natural food resources to grow an animal, such that it's not an efficient process. (Humans could just eat the grains/vegetables fed to the animals instead of the meat.).
Technological advances could of course mute/postpone the implementation of some of those changes, but only time will tell.
There would be no retirement age...but people would perhaps get sabbaticals where they could periodically take time off (5 - 10 years) to pursue personal interests.
The concept of money would change dramatically. The time value of money (how it grows overtime) would essentially become moot. And if it didn't, inflation would be so crazy as to negate its effect anyway. Otherwise, everyone could just work really hard for the first 100 - 200 years to grow a nest egg and then "live off the interest". Having a world full of people living off interest isn't possible if they are the ones providing the labor. If all of the labor is being provided by robotic workers, then the value of money and goods/services drops dramatically. The only cost to such systems are the cost of maintenance for the robots and the opportunity cost of allocating those "work units" to one task versus another. If all labor is done by robots, and all intellectual work is done by big data/AI, then what's left is creative pursuits and enjoyment.
One positive note related to your question is that there is probably a correlation between lifepsan and wisdom/tolerance. The longer people live, the less likely they may be to hold onto ignorant points of view (like racism). Even if that weren't true, the result wouldn't be much different than what you find today...racist people would choose to live removed from the target of their hatred. It is likely that all instances of intentional murder would be punishable by death. Since that person essentially robbed someone else of perhaps thousands of years of life there would be few punishments short of the death penalty could make up for that. Otherwise, people could kill someone...and happily go to jail for 500 years (where they would likely be safe from car accidents, plane crashes, and similar accidental causes of death) and be released having paid their debt to society. Life sentences are meant to be a deterrent to murder...as it essentially deprives the murdered of a meaningful life of their own. Since there's no way to know how long a person will live in the "immortal" scenario, the only appropriate punishment is death.