Question: "Littlest Things" is a song by an English singer who left school at what age?

English singer and songwriter Lily Allen has released three studio albums, two extended plays, 20 singles (including six as a featured artist), two promotional singles and 21 music videos. Allen's range of musical genres incorporates styles such as pop, ska, electropop and reggae fusion.  She became well-known through her Myspace account, on which she started posting demo songs in 2005.  The increase of popularity led to a contract with Regal Recordings.  Her debut single, "Smile", was released in 2006 and topped the UK Singles Chart for two weeks.  Allen's first studio album, "Alright, Still" (2006), was released shortly after.  The album was commercially successful, earning a three times platinum certification in the United Kingdom, and gold in the United States.  The album was nominated for Best Alternative Music Album at the 50th Grammy Awards.  Follow-up singles "LDN", "Littlest Things" and "Alfie" did not repeat her early success, although they still sold well; "LDN" peaked at number six on the UK Singles Chart. <SEP> Joseph Carey Merrick (5 August 1862 – 11 April 1890; often incorrectly called "John Merrick") was an English man with very severe deformities who was first exhibited at a freak show as the "Elephant Man", and then went to live at the London Hospital after he met Frederick Treves, so becoming well known in London society.  Merrick was born in Leicester, and began to develop abnormally during the first few years of his life: his skin appeared thick and lumpy, he developed enlarged lips, and a bony lump grew on his forehead, one of his arms and both of his feet became enlarged and at some point during his childhood he fell and damaged his hip, resulting in permanent lameness.  When he was 9, his mother died from bronchopneumonia, and his father soon remarried.  Merrick left school at the age of 13 and had difficulty finding employment.  Rejected by his father and stepmother, he left home.  In late 1879, Merrick, aged 17, entered the Leicester Union Workhouse. <SEP>  Written by Allen, Mark Ronson and Santi White, the song was released as the third single of the album on 11 December 2006 by Regal Recordings. "Littlest Things" is a song by British recording artist Lily Allen from her debut studio album, "Alright, Still".  It incorporates a piano sample from Pierre Bachelet and Herve Roy's music from "Emmanuelle", for which they were credited as co-writers, as the lyrics tackle the singer dealing with the departure of her boyfriend, while reminiscing about their time together.  The song was created in a New York studio, after Allen had met Ronson, who was impressed by her previous work and offered her different samples. <SEP>  She is the daughter of actor Keith Allen and film producer Alison Owen.  Allen left school when she was 15 and concentrated on improving her performing and compositional skills. Lily Rose Beatrice Cooper (née Allen; born 2 May 1985), known professionally as Lily Allen, is an English singer, songwriter, actress, and television presenter.  In 2005, she made some of her recordings public on Myspace and the publicity resulted in airplay on BBC Radio 1 and a contract with Regal Recordings.