No, not at all. 99% of my mothers and grandparents generation lived into their 80s and 90s and they were all sharp as a tack right to the end.
The hard times - real economic depression, wars, etc - that they lived through gave them the strength to endure just about anything.
The main thing they gained from those times was a sense of perspective. They learned not to let the little things bother them and also just what a large percentage of our "problems" are really little things.
My great-grandmother was born in 1868 and lived to 1964. By the time she was 26 she was a widow with four children. She lived through the Spanish American War, WWI, WWII, Korea and saw the beginning of Vietnam. She lived through the death of two husbands and her own daughter. She lived through the great depression - although most of her life had not been much better to begin with.
She was the most loving, happy, sweet woman I have ever met.
When she was in her early 90s we asked her "Of all the modern conveniences you have now, what would you hate to give up most?" We, of course were thinking about TV, radio, cars, planes, refrigerator, washing machine, telephone etc. She looked at us and said simply "running water".
Running water meant you wouldn't have to be thirsty, you could grown at least enough food to feed your children, you could maintain sanitary conditions for your family.