The popularity of smartphones has created a new generation of middle-aged gamers, according to a new study.
Researchers estimate that more than 15 million people aged over 31 play games on their mobiles, with many of them former gamers picking up the hobby again.
The study found more than half (55%) of 31 to 44-year-olds play games, with more than a third (37%) of 45 to 60-year-olds also using their phones for gaming.
David Johnson, general manager devices for O2 in the UK, said: "Mobiles have brought a new generation to games - some coming back to them having played them in their formative years, others having been introduced to games by the phone for the first time.
"Playing games is something that now cuts across generations - driven by the latest generation of smartphones that have bigger screens, are more responsive and deliver really rich gaming experiences - regardless of the age of the person playing them."
The report, which was timed to coincide with the launch of a Samsung Galaxy S4, found more than half of gamers (58%) play every day with the most popular games including Angry Birds, Solitaire and Temple Run.
The report was based on research conducted amongst 2,000 UK smartphone users by OnePoll between 1 May and 4 May 2013.