Robson among three to sign for Wasps
Robson was recently called up to England's Elite Player Squad for the forthcoming internationals after a fine start to the season.
The 24-year-old scrumhalf, who had previously represented England with the Saxons team, has now been rewarded by Wasps as well.
"It was a really easy decision to re-sign," Robson said.
"I'm really enjoying the attacking brand of rugby we play and I feel my game has improved massively since I've been at Wasps."
Young, the son of Wasps' boss Dai Young, has impressed in the back-row last term, while former Sale lock Myall has made 74 appearances for the club since arriving in 2013.
Young's performances last term put him on the brink of a senior Wales call-up, but injury denied him the chance to compete for the chance to tour New Zealand with Warren Gatland's side.
"I have really enjoyed my time at the club and feel like I have developed a lot as a player," Young said.
"I am very excited about the direction the club is moving in and the calibre of players we have got at Wasps is a massive draw. I feel like this is the right place for me to carry on developing."
Agence France-Presse
