Well....that's why DH and I are beginning to visit the senior living facilities around our area. There are a lot to choose from - the upside of living in a thriving urban area. Costs are high and services vary, so a lot to consider/compare.
We did a lot of retirement planning in our late 40's and 50's. MIL helped us a lot - she lived with us for seven years - so when she passed away unexpectedly, her assets doubled our modest portfolio which gave us the "breathing room" we needed to feel more secure against inflation. We like to travel a regular "circuit" around Northern CA and in 10 yrs of retirement we've seen travel/food costs rise at least 35-45%.
We have very generous LTCi policies so we have the option of just moving to a condo rental for a while. We could use home healthcare services to assist since the policies pay for 50% of the cost (they are older policies; new LTCi policies pay 100% of daily benefit). We have friends who can be trusted to be good tenants for our current SFH so renting it out would be no problem. Our home is paid off but with the so-called 'tax reform' changes ending in 3 yrs, would rather wait to see what Congress does before deciding whether to sell.
We got the LTCi policies because after doing a budget and starting our retirement planning, it was obvious that a serious disability/illness to one of us, even with our very good retiree health insurance, could easily cause financial distress to the other spouse.
With no kids we felt it best to have a solid "back-up plan". I do have family nearby but the next generation is stressed with the "sandwich" issue of small kids/aging parents who didn't plan well. Didn't want to add to their issues!
BTW, I don't think it's accurate to say "Medicare will help". Medicare does very little in regards to senior living. If you are thinking of Skilled Care, aka Nursing/Convalescent, Medicare pays only 120 days IF you go straight from the hospital under doctor's orders.
Medicare will NOT pay if you are in the hospital "Under Observation" before being transferred to a SC facility, no matter how many days you spend in the hospital. You must actually be admitted to the hospital as a patient.
If you need Skilled Care long-term, that is what state Medicaid programs pay, not Medicare. Thus you are reliant upon what your state of domicile's program will pay for, not Medicare.
Neither Medicare nor Medicaid generally pays for Assisted Living, only Skilled Care/Convalescent.