More than 1,000 D.C. police officers will become eligible to retire in the next five years, the beginning of a “retirement bubble” that has some officials concerned with the department’s ability to keep up with the departures.

A host of sworn police officers hired in the 1980s and early ’90s will become eligible to retire soon as they meet two requirements — officers hired during that time must be at least 50 years old and have served on the force for at least 25 years.