Every generation gets old, but for those who were told we’d be forever young, it just seems more painful. “It’s a huge issue,” says Dr. Anna Fels, a psychiatrist in New York. “I see so many who are trying to adjust their lives to this new phase, which for some reason none of us really pictured ourselves going through.”

Why didn’t we? We knew that eventually more people around us would be younger rather than older. But it still rankles. The image of a room filled with younger people is the perfect symbol.

“It’s an important marker for this generation because it reminds them that they are now the ones closest to obsolescence, the ones the world can do without,” says Dr. Roger Gould, a psychiatrist and the author of “Transformations,” a book about age-related adult problems.