One of my great Aunt's died at age 95 about 10 years ago. She wasn't overweight and ate fairly simply, liked a glass of sherry. Not sure what she ate exactly but it would have had plenty of bread, meat, veges, cheese, cake, butter, cups of tea etc. She did have a very good sense of humour and died after a short illness.
Another relation the above aunt's first cousin also died in her mid 90s. Aunt Em also had a good sense of humour and had a tough life when young. She was overweight and probably had a similar diet. Sadly her son died suddenly when in late 60s, he had high blood pressure was on medication and was very overweight and of a nervous disposition - dont' know if that makes a difference.
All 4 of my grandparents died between 75 and 79.
My husband's grandparents lived late 80s early 90s and two of them kept very active walking on Dartmoor, Devon until mid 80s and I think kept themselves busy and had a big veg garden. Another of his grandmother's was very overweight a real misery guts, bitter and twisted and she lived until 88! so having a happy disposition may or may not help you to live longer.
I think we are far more educated about what constitutes a 'healthy' lifestyle now, well at least we think we do as we wouldn't be members of this forum....unless it's all an illusion!