From left: Sharlene Whyte, Aran Murphy and Robbie Gee David Reiss/Rich Gilligan/Karen Scott EXCLUSIVE: Sharlene Whyte, Aran Murphy and Robbie Gee have joined Sharon Horgan in the HBO comedy series Youth, from Horgan's production banner Merman. Deadline first reported HBO was picking up the series last year after Horgan and her company signed a first look deal with HBO. Rupert Friend is also on board to star.