Older children 'tuning into Vimeo'
Older children watch half the amount of live television per day as adults - but are topping this up by watching content online, a study has found.
Ofcom's Children's Digital Day research found older children aged 11 to 15 are watching one hour and 32 minutes of live television a day, while adults watch two hours and 58 minutes.
But this age group of children is spending six times longer than adults watching short online video clips on sites such as YouTube and Vimeo, at 33 minutes compared with five minutes.
The study also found that nearly all UK adults reported watching live television every day over the course of a week (94%), compared with just over three quarters (78%) of children aged 11 to 15 and 90% of six to 11-year-olds.
Adults listened to five times more radio each day than children in the study, at one hour 19 minutes versus 15 minutes.
Adults are also more than three times more likely than older children to talk on the phone each week (83% versus 25%) - and spend six times longer talking on the phone, at 29 minutes a day versus five minutes.
Older children spend twice as long communicating via social networking sites than adults each day, at 52 minutes versus 25 minutes.
The communications regulator said: "Ofcom recognises that growing internet and on-demand viewing will pose new challenges for protecting children from unsuitable content in the future.
"Ofcom is working with Government, other regulators and industry to ensure that children remain protected if they choose on-demand TV or online content over traditional broadcast TV, where Ofcom's strict watershed rules apply.
"This work will help ensure consumers have a clear understanding of the protections that apply on different platforms and devices, and make sure the public are aware of which regulatory body they should notify any concerns or turn to for advice."