I was diagnosed with a chronic illness aged 16 and I'm now 27. I've had a few big scared through the years, things are relatively calm now, but I'll likely never be able to work fulltime. I took a parttime distance learning degree because I couldn't go to college fulltime.
Because I'm working parttime, it's harder for me to save. The upside is that I don't work all day, so I guess you could say I'm parttime retired already (and have been since age 22, when I last worked a fulltime job).
On the other hand, FI is more important to me because of my illness. I've experienced what it's like when you're suddenly in hospital and you lose your job. I never want to be poor again. My country also has a rigid retirement system where it's pretty hard to retire before government retirement age (which will probably be something like 70 for my generation, it's 66 currently and slowly going up to 68). I realistically might not make that age, or be in considerable ill health, which is why I'm set to RE. That way I might actually enjoy my retirement.
These things are pretty much contradictory, so I'm trying to find a balance between living for now and living for the future. The current balance is that I put €155 of my €1200 net wage into investments and €200 into a savings account, which is a savings rate of about 30%. We live in a cheap house with a €300 mortgage payment that we're planning to have paid off in less than 15 years. My current investment rate isn't enough to ever RE, but in future I might be able to put more money into it. I don't have a comfortable emergency fund yet, but once I get there, I can put that money into investments. I plan for a relatively large emergency fund to make sure I'll always have enough cash on hand in case of a medical emergency (HELOCs aren't a thing in my country). If we indeed have the house paid off when I'm about 40, I hope to be able to retire aged 50. It'll take some hard work, but I think it's doable.