How long were 8 tracks in use?

Answer 1

8-track tapes were introduced in the late 1960s and became popular throughout the 1970s. Their usage peaked in the early 1970s, but by the late 1970s and early 1980s, they began to decline in favor of cassette tapes and other formats. By the mid-1980s, 8-tracks were largely obsolete, although some collectors and enthusiasts still appreciate them today.