I may well end up not being able to work until normal retirement age due to various health issues, none of them caused by lifestyle (genetic auto-immune problems). So I've given this some though, but obviously I'm biased.
I want to work and earn for as long as I can, of course. Maybe there will even be a cure one day, although currently medical science doesn't even understand the problem. Of course, I might end up with a small pension and early retirement, and then be reliant on benefits. I hope I won't, but can't rule it out.
There are too many variables. If there is a cure one day, it might be really expensive. More expensive than I can afford perhaps, but it might be in society's interests to give it to me anyway. I find some people blame me for my condition, even though it isn't my fault, but I do kind of understand them. To them I look normal, no obvious signs of illness. They can't understand why I don't, for example, exercise more. They don't know what its like to live with this stuff, or understand why I have to be "lazy" in order to keep functioning. If I seem reluctant, they think it's just me not making an effort to look after myself, but that isn't the case. So I worry that in future there may be even less sympathy than there is now.
The human body is pretty unreliable, it seems. I don't know anyone who reached 35 without at least one major problem. It's expensive to fix too. We need to stop blaming people and figure out how to make things better for everyone, without feeling jealous that some are getting more help than others.