Question:  Live at Winterland '68 is an album by an American rock singer who died of a neroin overdoase at what age?

Context paragraphs:
Happening '68: Happening '68 was a rock and roll variety show produced by Dick Clark Productions, which aired on the American Broadcasting Company (ABC) network.  The show followed "American Bandstand" on Saturday afternoons.  "Happening '68" premiered on January 6, 1968 and was popular enough that ABC added a weekday spin-off.  "It's Happening" ran on Mondays through Fridays from July 15, 1968 through October 25, 1968.  When 1968 ended, "Happening '68" became just "Happening", which was canceled in October 1969.

Janis Joplin: Janis Lyn Joplin ( ; January 19, 1943 – October 4, 1970) was an American rock singer and songwriter.  She was one of the biggest female rock stars of her era.  After releasing three albums, she died of a heroin overdose at age 27.  A fourth album, "Pearl", was released in January 1971, just over three months after her death.  It reached number one on the "Billboard" charts.

Winterland June 1977: The Complete Recordings: Winterland June 1977: The Complete Recordings is a 9 CD live album by the American rock band the Grateful Dead.  It contains three complete concerts.  It was recorded on June 7, 8, and 9, 1977, at the Winterland Ballroom in San Francisco, California.  The album was released on October 1, 2009.

Winterland 1973: The Complete Recordings: Winterland 1973: The Complete Recordings is a 9 CD live album by the American rock band the Grateful Dead.  It contains three complete concerts, missing only the encore of the first concert.  It was recorded on November 9, 10, and 11, 1973, at the Winterland Ballroom in San Francisco, California.  The album was released on April 1, 2008.

Thirty Seconds Over Winterland: Thirty Seconds Over Winterland is an album by the American psychedelic rock band Jefferson Airplane.  It was recorded live in August and September 1972, at the Auditorium Theatre in Chicago and the Winterland Ballroom in San Francisco.  It was released in April 1973 as Grunt BFL1-0147; reflecting the band's declining commercial stature, it only peaked at #52 in "Billboard".

Live at Winterland '76: Live at Winterland '76 is a live album by the Electric Light Orchestra (ELO) released in 1998.

Autumn '67 – Spring '68: Autumn '67 – Spring '68 is a 1972 compilation by the English psychedelic rock and progressive rock group the Nice.  It was released in 1973 in US as "Autumn to Spring".  The album consists of outtakes and alternate versions recorded in Autumn '67 – Spring '68.  The album has been reissued on vinyl as "The Nice Featuring America".  The album was remastered and reissued on Japanese SHM-CD in 2009.  All of these tracks were also included as bonus tracks on 1990 reissues of the Nice's "Five Bridges" and "Elegy" albums.

Wayne Newton Live in Concert: Wayne Newton Live in Concert was a Pay-Per-View concert special starring Wayne Newton that aired live from the Westgate Las Vegas Resort & Casino (then called the Las Vegas Hilton) on May 23, 1989.  The concert was one of only a handful of times that Newton has starred in a concert special featuring his entire Las Vegas show, and was also a way of promoting his then-new album "Coming Home."  The show was directed by Steve Binder, the same man who directed Elvis Presley's '68 Comeback Special.  Select pieces of the show were put together in a video cassette titled "Wayne Newton: Live In Concert at the Las Vegas Hilton" & was released in 1998.

Jennie Yeamans: Jennie Yeamans (1862 – 28 November 1906), born Eugenia Marguerite Yeamans, was a child actress and singer popular in the 1870s and 1880s, and later a famous adult singer and actress.  She was the younger sister of early silent film character actress Lydia Yeamans Titus and had another sister, Emily Yeamans, who died young.  Of the three sisters, Jennie was the most famous and successful right up to her death.  Their mother was Annie Yeamans (1835 – 1912), a well known character actress in the Victorian era stage.  Her father was Edward Yeamans, a circus clown.  The Yeamans family came from Australia and toured China, Japan and Java in traveling shows before arriving in San Francisco in 1865.  After arriving in America, Edward Yeamans died in 1866 or '68.

Live at Winterland '68: Live at Winterland '68 is an album by Janis Joplin with her band Big Brother and The Holding Company.  It was recorded at the Winterland Ballroom on April 12, 1968, and April 13, 1968 and includes live renditions of songs from their studio albums.

Supporting paragraphs: Live at Winterland '68 Janis Joplin
Answer: 27