What better source you can have for learning what leads to a longer life, than asking the longest living people themselves?
My main source in the wikipedia page about verified longest living people
In their own opinions/words.
Jeanne Calment (122 years, 164 days)
Calment ascribed her longevity and relatively youthful appearance for her age to a diet rich in olive oil (which she also rubbed onto her skin), as well as a diet of port wine, and ate nearly one kilogram (2.2 lb) of chocolate every week. She also credited her calmness, saying, "That's why they call me Calment." Calment reportedly remained mentally intact until her very end.
Sarah Knauss (119 years, 97 days)
Her daughter, Kathryn Sullivan, aged 96 at the time, opined that Knauss is "a very tranquil person and nothing fazes her."
Misao Okawa (117 years, 27 days)
Okawa said that "sushi and sleep" were the reasons why she lived so long.
Maria Capovilla (116 years 347 days)
She never smoked or drank hard liquor.
Susannah Mushatt Jones (116 years and 311 days)
She only took high-blood pressure medication and a multivitamin. Jones never smoked or consumed alcohol. She slept about ten hours a night and napped throughout the day. For breakfast, she always ate four strips of bacon along with scrambled eggs and grits. She also ate bacon throughout the day.
Emma Morano (116 years, 277 days)
When asked about the secret of her longevity, she said that she had never used drugs, eats three eggs a day, drinks a glass of homemade brandy, and enjoys a chocolate sometimes, but, above all, she thinks positively about the future.
Elsewhere: Morano credits her long life to her diet of raw eggs and being single.
Gertrude Weaver (116 years, 276 days)
Weaver told the Associated Press that there were three factors that have contributed to her longevity: "Trusting in the Lord, hard work and loving everybody." Weaver added a fourth factor when she told Time magazine that trying to do your best is another factor adding: "Just do what you can, and if we can't, we can't" or, in other words, "Kindness"
Besse Cooper (116 years, 100 days)
Cooper reportedly attributed her longevity to "minding her own business" and avoiding junk food.
Jeralean Talley (116 years, 25 days)
She lived by the Golden Rule: "Treat others the way you want to be treated". She was known in the community for her wisdom and wit, she had sometimes been asked for advice. She had previously advised people to use common sense, saying "I don't have much education but what little sense I got, I try to use it."
I find it fascinating that so many of my own discoveries of factors affecting weight-loss have also to do with longevity.
Being calm (and reducing stress) seems to be an important factor I appear to have missed. Could it be hidden in the "stayhome" feature?
Chocolate appears twice above, I wonder which type of chocolate because bittersweet/dark chocolate typically has much less sugar than milk chocolate.