Americans of all ages continue to adopt a digital lifestyle, according to an annual survey of consumers’ technology adoption and attitudes by Forrester Research.

High-definition televisions (HDTVs) and home networks were two of the fastest-growing consumer technologies in 2008. Over the next five years, 39 million U.S. households will get their first high-definition set and more than 30 million homes will add network connectivity. Forty-four percent of U.S. households have a laptop, and the average American family owns two personal computers.

While media consumption among all Americans is split evenly between new and traditional media, on average, consumers younger than 40 spend almost 2 hours a week more with new media they do with traditional media.

Four in five U.S. households now have a mobile phone and families with older children have nearly three mobile phones per household, the most of any age segment. Eight percent of consumers own a smartphone.

“The Internet pervades all aspects of Americans’ lives, from how we shop and buy, how we communicate, how we entertain ourselves, and how we seek out information to how we manage our personal relationships,” said Charles S. Golvin, Forrester Research Principal Analyst.

“While today these digital activities are constrained to the home and the office, in the next several years consumers will increasingly rely on a ubiquitous Net that is instantaneously accessible on a wide variety of devices, from mobile phones to laptops to new form factors such as eReaders.”