Annie Proulx

Its never too late to start. Annie Proulx didn't start writing fiction until her 50s. 

She published her first novel, Postcards, when she was 56. 

https://www.theguardian.com/books/2016/jun/05/annie-proulx-ive-had-a-life-i-see-how-slippery-things-can-be