A different kind of spa.
In 2002, Carly, Emily and Rose were kidnapped and held at a spa, where they received aging treatments. It was eventually revealed that Barbara had asked James to rid her of the women, who she perceived as her enemies.
When the truth came out, Hal and Paul disowned Barbara. However, John stepped up to help her, seeing that she was sinking into madness under James' thumb. James had also brainwashed Hal to help him elude capture.
Rose eventually escaped the spa and a guilty Barbara helped facilitate Carly and Emily's release. Luckily for the three lovely Oakdale ladies, the treatments were eventually reversed.
Take a look at a couple of videos from the time the aging process took effect. Feel free to discuss this storyline in the comments below.