From a notice that Social Security has scheduled for publication in the Federal Register:
We propose to revise the time period that we consider when determining whether an individual’s past work is relevant for purposes of making disability determinations and decisions. Specifically, we would revise the definition of past relevant work (PRW) by reducing the relevant work period from 15 to 5 years. This change would allow individuals to focus on the most current and relevant information about their past work, better reflect the current evidence base on changes over time in worker skill decay and job responsibilities, reduce processing time and improve customer service, and reduce burden on individuals.
This is overdue by about 40 years but better late than never. It never made sense to tell disability claimants that they are not disabled because they can return to jobs they last held 12 years ago. Work skills just don't stick with people that long.