Question:
The Clark Sisters are an American gospel vocal group consisting of five sisters: Jacky Clark Chisholm (b. 1948), Denise Clark Bradford (b. 1953), Elbernita "Twinkie" Clark-Terrell (b. 1954), Dorinda Clark-Cole (b. 1957), and Karen Clark Sheard (b. 1960). The Clark Sisters are the daughters of gospel musician and choral director Mattie Moss Clark. They are credited for helping to bring gospel music to the mainstream and are considered as pioneers of contemporary gospel.
The Clark Sisters were born and raised in Detroit, Michigan. They each began singing at an early age, and by the late 1960s they were all performing together in church services, usually singing songs written and arranged by their mother. A few years later, Dr. Mattie Moss Clark turned over control of the group to Twinkie, who would then go on to write, arrange, conduct, and produce all of the Clark Sisters' recordings. In 1973, the sisters recorded their first album, Jesus Has A Lot To Give, on their uncle's local label Billesse Records. The following year, Dr. Mattie Moss Clark Presents The Clark Sisters was released and people around Detroit began to take notice of the group. The Clark Sisters signed to Sound of Gospel Records in 1974. Under this association, the group released albums such as Unworthy, Count It All Joy, and He Gave Me Nothing to Lose. It was not until the early 1980s that The Clark Sisters began to become more widely known. Their popularity soared with the release of the live recording Is My Living In Vain. The first live recording by The Clark Sisters spent an entire year at number one on Billboard's Gospel Music chart. Opening with the bluesy title track, each sister vocally declares that their dedication to Christ is not a useless effort. The innovative "Hi ya" was funky enough to find its way into a Tonex produced track over two decades later. Karen Clark's lead on "Speak Lord" expresses deep faith while the call to worship is raised on "Now Is The Time". Another hit from this release, "Expect Your Miracle", is still a staple in black churches across the country. Their next release You Brought the Sunshine would prove to be a monster hit via the title track. Reminiscent of Stevie Wonder's "Master Blaster (Jammin')," the song became a hit in church houses and on dance floors, including New York's Studio 54. "Sunshine" was picked up from its original independent gospel record label Sounds of Gospel and distributed by both Westbound Records and Elektra Records. In 1983, the song peaked at #16 on the Black Singles chart, #27 on the Club Play Charts, and #80 on the Hot R&B Charts driving the album to Gold sales. This album continues to display Twinkie's signature blend of scripture with unprecedented vocal and musical arrangements on biblically based songs like "Psalms 31." The album's other songs include the sincere prayer found within the lyrics of both "Center of Thy Will" and "Endow Me," featuring a young but already vocally mature Karen, as well as "Overdose of the Holy Ghost", showcasing Dorinda's vocal dexterity. The disco-inspired "He Keeps Me Company" is noted for its bubbly syncopation. The sisters delivered another progressive effort in 1982, Sincerely, which included "Name It And Claim It" and the politically charged "World." Though its success was overshadowed by the previous hit "You Brought The Sunshine", the album received a Grammy nomination.
Answer this question using a quote from the text above:

how old were they when they started singing

Answer:
They each began singing at an early age,

Answer the question at the end by quoting:

Yes are an English progressive rock band formed in London in 1968 by singer Jon Anderson, bassist Chris Squire, guitarist Peter Banks, keyboardist Tony Kaye, and drummer Bill Bruford. The band have undergone numerous formations throughout their history; nineteen musicians have been full-time members. Since June 2015, it has consisted of guitarist Steve Howe, drummer Alan White, keyboardist Geoff Downes, singer Jon Davison, and bassist Billy Sherwood, with no remaining founding members. Yes have explored several musical styles over the years, and are most notably regarded as progressive rock pioneers.
In 1980, pop duo the Buggles (keyboardist Geoff Downes and singer Trevor Horn) acquired Brian Lane as a manager. At this point, the departure of Anderson and Wakeman had been kept secret from everyone outside the Yes inner circle. Seeing an option of continuing the band with new creative input and expertise, Squire revealed the situation to Horn and Downes and suggested that they join Yes as full-time members. Horn and Downes accepted the invitation and the reconfigured band recorded the Drama album, which was released in August 1980. The record displayed a heavier, harder sound than the material Yes recorded with Anderson in 1979, opening with the lengthy hard rocker "Machine Messiah". The album received substantial radio airplay in the late summer-fall of 1980, and peaked at number 2 in the UK and number 18 in the US, though it was the first Yes album to not be certified Gold by the RIAA since 1971. Their 1980 tour of North America and the UK received a mixed reaction from audiences. They were well received in the United States, and were awarded with a commemorative certificate after they performed a record 16 consecutive sold out concerts at Madison Square Garden since 1974. After the Drama tour, Yes reconvened in England to decide the band's next step, beginning by dismissing Lane as their manager. Horn chose to leave Yes to pursue a career in music production, with White and Squire next to depart. Left as the sole remaining members, Downes and Howe opted not to continue with the group and went their own separate ways in December 1980. A live compilation album of Yes performances from 1976 to 1978, mixed in mid-1979 and originally intended for release in late 1979, was released as Yesshows, peaking at number 22 in the UK charts and number 43 in the US. An announcement came from the group's management in March 1981 confirming that Yes no longer existed. Downes and Howe later reunited to form Asia with former King Crimson bassist and vocalist John Wetton, and drummer Carl Palmer from Emerson, Lake, and Palmer. Squire and White continued to work together, initially recording sessions with Jimmy Page for a proposed band called XYZ (short for "ex-Yes-and-Zeppelin") in the spring of 1981. Page's former bandmate Robert Plant was also to be involved as the vocalist but he lost enthusiasm, citing his ongoing grieving for recently deceased Led Zeppelin drummer John Bonham. The short-lived group produced a few demo tracks, elements of which would appear in Page's band the Firm and on future Yes tracks "Mind Drive" and "Can You Imagine?". In late 1981, Squire and White released "Run with the Fox", a Christmas single with Squire on vocals which received radio airplay through the 1980s and early 1990s during the Christmas periods. A second Yes compilation album, Classic Yes, was released in November 1981.

Did the band split up in 1980-81?
Horn chose to leave Yes to pursue a career in music production, with White and Squire next to depart.