APA style writing.....do I use ones or one's?

Question

When I am saying:

One's life style.......

Answer 1

Regardless of writing style, "One's" is the appropriate choice.

"Ones" signifies the plural of "one" (as in referring to a wad of bills containing many one-unit notes).

"One's" is the gender-neutral possessive, and as such is appropriate in the beginning of the sentence above.