Young people between the ages of 16 and 24 spend more than 27 hours a week on the Internet, communications watchdog Ofcom said as it laid bare the extent of the UK's changing internet habits over the last decade. People are spending twice as much time online compared to 10 years ago, fuelled by increasing use of tablets and smartphones. The biggest increase has been among young adults, with time spent online almost tripling from 10 hours and 24 minutes each week in 2005 to 27 hours and 36 minutes in 2014.