Smartphone penetration reached 77% of the US mobile subscriber market (13+) during Q1 (the 3-month average ending in March), up from 74.9% in Q4 2014 and 68.8% in Q1 2014, according to the latest comScore figures. Compared to that ~8-point year-over-year increase, penetration growth has been strongest for subscribers aged 13-17 (up 10 points to 85%), 45-54 (up 10.7 points to 63.7%) and 65+ (up 11.6 points to 49.1%).
It’s worth remembering that the data is limited to mobile subscribers rather than the general population. A recent survey from the Pew Research Center, for example, found that just 27% of adults aged 65+ own a smartphone. Source: comScore