What is the age histogram of people who play casual mobile games like Cut The Rope, Angry Birds and so on?
Here is a source, i do not know if it can be trusted but it looks legit. http://www.statista.com/statistics/246577/age-distribution-of-mobile-gamers/
To put the answer right here the largest group of mobile gamers have an age of 25 to 34 and represent 27% of the total.
2nd and 3rd are surprisingly older with 23% for 35-44 years and 18% for 45 to 54 years.
Only 16% of the ages of 18 to 24, but i am sure it would be significantly bigger if they would have count it from the age of 15.
Last but certainly not least we have the 55+ gamers representing 16%. Who would have expected that?
Tracking the references in this Forbes Article: New Report Details Demographics of Mobile Gamers Buying Virtual Goods
The MocoSpace study, as well as numerous others with similar data is available through Fact Browser.
A Flurry report shows an interesting pattern in freemium games - mostly younger people play (age groups 18-24, then 13-17), but older people pay (age groups 25-34, then 35-54).