The oldest person ever to live independently was Annie Jennings who reached the age of 115 while still living in her own flat independently until her death.
Charlotte Hughes was also very impressive,she lived on her own until 114 before she moved to a nursing home dying at 115.
Some more ages that currently living supercentenarians have lived on their own
Neva Morris=Independent until 100
Gertrude Baines=Independent until 105
Mary Josephine Ray=Independent until 107
Olivia Patricia Thomas=Independent until 109
Henry Allingham=Independent until 106 (in his own flat with caretaker until 109)
Aarne Arvonen=Independent until 108
Leila Denmark=Independent until 106
Annie Butler=Independent at 111 (oldest independently living human)
(Living in a nursing home isn't equal to being frail since for example Walter Breuning has not been "independent" but lived in a nursing home since he was only 83 and is still in good health at 112)
Most supercentenarians have been very small,here are some heights.
1.Jeanne Calment 4'11
2.Sarah Knauss 4'7
3.Marie-Louise Meilleur 4'11
4.Christian Mortensen 5'3½
5.Tomoji Tanabe 4'9
6.Giovanni Frau 4'10
7.Edna Parker 5'0
8.Beatrice Farve 4'7
9.Clara Huhn 5'2
10. The big exception is Julie Bertrand who was 5'8 ( so apparently a woman of average height can live to 115.)
A disproportionate amount of the people having reached 115 have been childless (7 of 21) and only 2 have been men.
As for Lifestyle advice to live really long
1.Jeanne Calment=Olive oil,chocolate, port wine, Foie Gras (regarding smoking she didn't start until she moved into the nursing home and only 1 cigarette a day after dinner)
2. Sarah Knauss=Chocolate, potato chips, pretzels.
3. Marie-Louise Meilleur= vegetarian, hard work.
4. Hendrikje Van Andel=Herrings, Avocaat( a drink)
5.Edna Parker= Lard, meat
6. Christian Mortensen= Vegetarian( drank enormous quantities of water)
7. Tomoji Tanabe=Miso soup,fish,vegetables
8.Maria de Jesus= Fish instead of meat, warm milk with sugar, rice pudding