In both relative and absolute terms, though, it’s been the youngest and oldest groups that have driven the uptick in smartphone penetration. Remembering that these percentage figures are among mobile subscribers, consider that:
As of December 2014, 83.7% of teens (13-17) owned a smartphone, up from 58.9% in January 2013;
The percentage of 55-64-year-old mobile subscribers with a smartphone grew from 40.4% to 61.5% during that timeframe, passing the majority threshold in January of last year; and
Almost half (46.6% of) mobile subscribers aged 65 and older owned a smartphone in December 2014, almost double the share (24.5%) from January 2013.
More findings at the link.