Not sure, maybe lifespan estimates based on current behavior could be handy. Eg are you a smoker? Are you regularly physically active? What's your race, occupation, etc?

I think chronic conditions are also hard to plan for in your head, so some preset stats-based options for medical costs could be helpful.

No one intuitively imagines it'll happen to them but something like 60% of 65yo+ adults managed 2 or more chronic conditions, which are conditions like heart disease, diabetes, strokes, and of course cancer. It's more likely than you think. Stuff like cancer won't just kill you sooner, it'll bleed you dry towards the end of your life as you attempt all manner of surgeries and treatments to delay the end.