Yes, most would be lost without electricity. In the process of change, many would perish. You are not looking at the whole picture - no food (except non perishable), no uncontaminated water supply, no lights, no heat, no air conditioning. Many would perish within the first few month.
The young would have a better chance of survival, but for many, no...
One thing to take into consideration is that many people are literally being kept alive by technology. That's why average life expectancy was much lower in pre-modern times. Not that nobody lived into their 80s and 90s, but those that did were typically healthy and free of disease.
Technology greatly extends the life spans of those who are unhealthy and who would otherwise have died already. Dialysis treatments for diabetics, heart-surgery for those with heart disease, chemotherapy for those with cancer, the list goes on. Just look at how many people live well into their 70s and beyond but depend upon a very large amount of pills to keep them going. It is those who are dependent upon medicine that will have the most to lose if we ever lose our electricity.
As I near the age of 50, I still insist on walking vigorously at least two hours a day and other than a 2-week antibiotics prescription for a sinus infection when I was in my 30s, I never took a prescribed drug - ever. I would be nervous if I ever became dependent upon prescription drugs.