Jeunesse first appeared on Monday, September 1, 1997 on TF1, replacing Club Dorothée after 10 years, with the first episode of Beetleborgs.

Poussier had previously created the morning program Salut les Toons, which was presented by two CGI-generated mice, in 1996, and aired until 2000.

It was given the difficult task of revitalizing children's programming on TF1, whose ratings had been in decline thanks to the popularity of Les Minikeums on France 3.

[1] At the time of La Planète de Donkey Kong on France 2, Poussier suggested a program without animation and presenters using the same model in the UK from ITV's CITV.

In addition to new European programs, TF1 can rely on agreements with Nickelodeon (broadcasting Hey Arnold!)

In that case, a few programs with audiences also appear (Franklin, Jimmy Neutron, Totally Spies!, Sonic Underground) and allow the channel to bounce back and resist Yu-Gi-Oh!

After creating tfou.fr, TF1's first children's website, in 2000, a TFOU TV channel was launched to strengthen the youth offering of TPS satellite package, of which Groupe TF1 was the main shareholder.

TFOU was launched on 23 April 2003 without a license from the CSA, so it stopped broadcasting before resuming on May 28, 2003 after being approved.