Austen lived her entire life as part of a close-knit family located on the lower fringes of the English landed gentry. She was educated primarily by her father and older brothers as well as through her own reading. The steadfast support of her family was critical to her development as a professional writer. Her artistic apprenticeship lasted from her teenage years until she was about 35 years old. During this period, she experimented with various literary forms, including the epistolary novel which she tried then abandoned, and wrote and extensively revised three major novels and began a fourth. From 1811 until 1816, with the release of Sense and Sensibility (1811), Pride and Prejudice (1813), Mansfield Park (1814) and Emma (1815), she achieved success as a published writer. She wrote two additional novels, Northanger Abbey and Persuasion, both published posthumously in 1818, and began a third, which was eventually titled Sanditon, but died before completing it.