According to a latest stats provided by Flurry, a mobile analytics firm, its the younger people who are playing most on freemium games but its the older guys who are paying for them.
These dynamics are actually pretty logical, as Flurry explains. If you play many of these games a lot, you are less likely to need to pay, since you can earn rewards and advancement through the gameplay itself (for example, virtual coins in a game like Tiny Tower). Younger people with time to play are therefore less likely to need to pay.
And older folk? 24 – 35 year olds presumably have more disposal income, but less time, due to work and family demands. This combination makes them less tolerant to engaging in 'the grind' but also better positioned to buy their way out of it. They play less often, but make quicker progress by simply spending."