The median audience age of the 10 biggest TV shows signals how few young people are tuning in

Description: "Season 1 of the spin-off of 'The Big Bang Theory' follows 9-year-old Sheldon Cooper as he grows up in East Texas and attends high school."

Seasons: One. It premiered Fall 2017.

Critic Score: 76%

Audience Score: 68%

Description: "Singers square off for a coveted recording contract in this reality talent contest from the producers of 'Big Brother' and 'Survivor.' Four vocal coaches mentor the contestants in three distinct competition phases: the blind auditions (during which the coaches can't see a contestant and thereby judge them solely on their vocal talent); the battle phase (in which the contestants are advised and developed); and, lastly, the live-performance phase."

Seasons: 14. It premiered Spring 2011.

Critic Score: N/A

Audience Score: N/A

Description: "A new comedy about a pair of brilliant physicists who understand how the universe works but have no clue about how to interact with people."

Seasons: 11. It premiered in Fall 2007.

Critic Score: 82%

Audience Score: 82%

Description: "From creators Ryan Murphy and Brad Falchuk (the 'American Horror Story' franchise, 'Nip/Tuck'), new procedural drama '9-1-1' explores the high-pressure experiences of police officers, paramedics and firefighters who are thrust into the most frightening, shocking and heart-stopping situations. These emergency responders must try to balance saving those who are at their most vulnerable with solving the problems in their own lives."

Seasons: One. It premiered Winter 2018.

Critic Score: 69%

Audience Score: 70%

Description: "The story revolves around five surgical interns and their supervisors, showing their personal and professional lives."

Seasons: 14. It premiered Spring 2005.

Critic Score: 72%

Audience Score: 79%

Description: "A loving but imperfect working-class family led by its `domestic goddess' mother was the basis of this classic, long-running sitcom. Issue-oriented storylines and its identifiable blue-collar characters made this the antithesis of the traditional warm-and-fuzzy family sitcom, and the success of its stand-up star inspired other comics (including Jerry Seinfeld and Tim Allen) to launch their own shows. "

Seasons: One. The revival premiered Spring 2018. The original show, which had nine seasons, premiered in 1988.

Critic Score: 75%

Audience Score: 68%

Description: "Several people begin to notice peculiar coincidences about each other in this dramedy."

Seasons: Two. It premiered in Fall 2016.

Critic Score: 90%

Audience Score: 87%

Description: "Snappy hit about a straight woman and a gay man who are best friends."

Seasons: One. The revival premiered Fall 2017. The original show, which had eight seasons, premiered in 1998.

Critic Score: 86%

Audience Score: 59%

Description: "A music mogul plans for the future of his empire as his three sons and his ex-wife battle each other to become the next heir apparent to the hip-hop throne."

Seasons: Four. It premiered in Winter 2015.

Critic Score: 85%

Audience Score: 78%