Reports from research firms today may finally rid twenty-somethings of the dreaded “Gen Y” label. Say hello to gen mobile.

62 percent of US mobile users between the ages of 25 and 34 own smartphones, compared to just 43 percent of all US mobile phone users, according to the latest mobile report from Nielsen.

Meanwhile, data from a Forrester survey of over 42,000 consumers shows that those under 22 use the web just about anywhere, and those between ages 21 and 31 are the “mobile generation”, with the highest smartphone and mobile web adoption among age groups. Shocking!

The research from both firms shows that those in their twenties and early thirties are a significant target for mobile device makers and app developers. Teens and slightly older thirty-somethings, for whatever reason, aren’t quite as mobile-savvy.

According to Nielsen, smartphone penetration for those 18 to 24 and 35 to 44 is around 54 percent (still much higher than the average). Forrester’s data shows that teens take mobile web access as a given, but since smartphones tend to be expensive (including hefty data plans), many parents are likely refusing to shell out the big bucks.

Older folks rank low on smartphone adoption, but Nielsen points out that those between 55 and 64 are the second-fastest growing group, jumping 5 percentage points this quarter to reach 30 percent.