Twitter devotees are grayer than one might expect: The majority of Twitter’s roughly 10 million unique Web site visitors worldwide in February were 35 years old or older, according to comScore.

In the U.S, 10 percent of Twitter users were between 55 and 64, nearly the same amount of users as those between 18 and 24, which accounted for 10.6 percent of the total.

Twitter has seen its popularity explode in recent months, with the number of unique visitors to its site increasing by more than 1000 percent year-over-year in February, according to comScore.

Social media Web sites like MySpace and Facebook have also experienced an increase in older users recently. But the parade of elders came after younger users drove the initial surge in popularity (in Facebook’s case, of course, the service was initially limited to college students).

Twitter is a rare example of older people embracing a new Web technology at such an early stage, says Andrew Lipsman, director of industry analysis at comScore.

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