I do not think online money making would require retirement, except of course if it is an individual choice or preference.
In the offline world, there are people who work their business line till they die and have the business taken over by their children or partners. There are also people who work government jobs and just as the norm is, they would have to retire after a certain working period.
There is something about online businesses that make retirement a thing not to be thought about by many. Perhaps the ability to work from your comfort zone, perhaps the minimal stress it accords, perhaps the privilege it accords one to do what he or she is best at.
If I have an online business that provides me steady and huge income, i think there would come a time I consider retirement. I must have earned enough and by then allow myself rest, and enjoy the money. Although there are certain jobs which even though done online could be stressful and would not soothe the weakness of old age; online businesses like forex and cryptocurrency. Such jobs would require one to plan retirement.
Albeit, retirement or not, while on our businesses, planning for the future is paramount and therefore should not be overlooked.