Social networking has so far focused mainly on businesspeople and young people because they are tech-savvy and are treasured by Madison Avenue.

Image Credit... Illustration by The New York Times

But there are 78 million boomers — roughly three times the number of teenagers — and most of them are Internet users who learned computer skills in the workplace. Indeed, the number of Internet users who are older than 55 is roughly the same as those who are aged 18 to 34, according to Nielsen/NetRatings, a market research firm.

TeeBeeDee’s founder is Robin Wolaner, who in 1987 created Parenting magazine. That year, at least seven magazines focused on being a parent were started, and Ms. Wolaner said she was seeing the same sudden recognition of a need for Internet publishers to respond to the demands of older Americans.

She came up with the idea for the site, she said, “when I was sitting around with friends and we said, ‘We’re not going to hang out at the AARP site. What is there for us?’ ” (Plus, she said, she wanted to find a community where she could discuss her interest in getting an eye lift).

“There’s a recognition that this generation now uses the Internet just like younger people,” she said. “The one thing this generation hasn’t done yet is network online.”

The question is whether they’ll want to network in large enough numbers to justify the tens of millions of dollars going into the space. Indeed, the interest from entrepreneurs and venture capitalists has led to a mini-boom in sites that cater to baby boomers, creating what they say is both critical mass and a likely falling out.