NEW YORK — At MySpace.com and many other popular online hangouts, a 30-something woman can celebrate her Sweet 16 over and over with just a click of the mouse.

A 12-year-old can quickly mature to meet the sites' minimum age requirements, generally 14, while an adult looking to chat with teens can virtually shed several years.

With heightened concerns over sexual predators lurking at so-called social-networking sites, state attorneys general have called for such communities, particularly MySpace, to improve age and identity checks.

If only it were so easy, many experts say.

"We're all just grasping for solutions," said Anne Collier, co-author of the forthcoming "MySpace Unraveled: What It Is and How to Use It Safely." "We haven't fully researched it and thought about all the implications."

News Corp.'s MySpace has met with several companies on technologies to verify ages, but it has yet to find an effective one, Michael Angus, general counsel of News Corp.'s Fox Interactive Media unit, told Congress last month.

In an interview, MySpace's safety czar, Hemanshu Nigam, said any technical solution must be part of a set that includes education and cooperation with law enforcement.

"As we progress in our evaluation of what's best out there, you're going to see many different things coming," he said.

Parents, school administrators and police have become increasingly worried that teens are finding trouble at social-networking sites, which provide tools for messaging, sharing photos and creating personal pages known as profiles. The aim of such sites is for users to expand their circles of friends.

MySpace has gotten the brunt of the complaints given its leadership with more than 94 million registered users, about 20 percent of them younger than 18.

In June, the mother of a 14-year-old who says she was sexually assaulted by a 19-year-old user sued MySpace and News Corp., seeking $30 million in damages. The lawsuit, filed in a Texas state court, claims the 19-year-old lied about being a senior in high school to gain her trust and phone number.

MySpace has recently implemented policies designed to better separate kids from adults. Among the changes, adult MySpace users must already know a 14- or 15-year-old user's e-mail address or full name to initiate contact or view a profile containing personal information.

However, because age is self-reported, as it is at similar sites, adults could simply sign up as minors.

More robust techniques like those from IDology Inc. and Sentinel Tech Holding Corp.'s Sentry check addresses, birth dates and other information users provide against public databases, such as voting and property records.

But many social-networking sites cater to both adults and teens — and teens can be difficult to verify.

Facebook takes a stab at verification by restricting access only to those with a valid e-mail address from a high school, college or participating company. It is happy to have 8 million registered users, less than 10 percent of MySpace's.

Industrious Kid Inc.'s imbee, for kids 8 to 14, requires parents to submit credit cards to vouch for their children.

Safety experts warn that creating too many barriers could drive kids to another social-networking site with fewer controls, or perhaps free-for-all chat rooms.

And ineffective solutions, they say, could give parents and children a false sense of security, increasing the dangers.

Ron Teixeira, executive director for the National Cyber Security Alliance, said parents should teach children an online equivalent of "Don't take candy from strangers." That way, he said, kids will know what to do should social networking be replaced by the next big fad.

"You need to take a holistic approach," Teixeira said. "Education is the way you teach children to be proactive, and that will stay with them forever."