In the U.S., as recently as last Summer, tablet and eReader owners tended to be male and on the younger side. But according to Nielsen’s latest, quarterly survey of mobile connected device owners, this is no longer the case.

Back in Q3 2010, for example, 62 percent of tablet owners were under the age of 34 and only 10 percent were over the age of 55. By Q2 2011, only 46 percent of tablet owners were under the age of 34 and the percentage of those over 55 had increased to 19 percent.

Looking at the data by gender underlines key changes in the eReader category. Sixty-one percent of all eReader owners are now female, compared to a mere 46 percent in Q3 2010. (Smartphone owners are now evenly split between male and female and tablets remain primarily male.)