Over one-fifth (21%) of Americans are “almost constantly” online, according to a new report from Pew Research Center. This is, of course, largely thanks to the increased prevalence of smartphones and other mobile devices.

73% say they go online on a daily basis, and 42% say they do several times a day. 10% do so about once a day. 13% do several times a week or less often. 13% of adults say they don’t use the Internet at all.

“Younger adults are in the vanguard of the constantly connected,” says Pew’s Andrew Perrin. “Fully 36% of 18- to 29-year-olds go online almost constantly and 50% go online multiple times per day. By comparison, just 6% of those 65 and older go online almost constantly (and just 24% go online multiple times per day).”

As the organization notes, this is the first time “almost constantly” has been a response option in its adult surveys, so it’s hard to say how much the group that checked that box has actually grown. It does point to another recent survey of teens, which found that about 24% reported going online almost constantly. In other words, teenagers and adults are pretty much in the same ballpark on that.

“And as is true for teens, adults with mobile connectivity are especially likely to be online a lot,” says Perrin. “About three-quarters of Americans use a smartphone, tablet or other mobile device to tap into the internet at least occasionally. Fully 87% of these users go online daily and 27% go online almost constantly. Among Americans who don’t use a mobile device as their way of getting on the internet, 65% go online daily and just 8% report that they go online almost constantly.”

College-educated adults, adults in higher-income households, and non-rural residents are among demographics with high likelihoods of going on line a lot.

Images via Thinkstock, Pew Research Center