According to a recent study, the older you are, the less likely you'll wait and the more likely you'll be to just whip out a credit card and buy an experience booster. Flurry Analytics conducted a survey of mobile and social gamers and found that older players are far more likely to just spend some money if it'll save some painful grinding in the long run.
While the study was focused on the social gaming side of the coin, the business model is not dissimilar from that employed by many free-to-play MMOs that frequently offer in-game options to earn items that can also be purchased outright. And the logical conclusion is drawn -- younger players have less disposable income but more time to buckle down and grind, while older players have more responsibilities and more free money to spend. It's an interesting look at the spending patterns, one which looks to be increasingly relevant as free-to-play options continue to multiply.