How about recruiting old workers and technicians over 55?

Not bad. Old employees over 55 years old are familiar with their work and skilled in machine maintenance. Their efficiency and quality are not lost to younger employees, and even more practical and capable than younger employees. Mechanic refers to a professional technician who is engaged in the repair and maintenance of large-scale complex machinery and equipment, and conducts technical demonstration, analysis, summary and report on maintenance equipment, overhaul equipment, testing equipment, maintenance equipment and machinery to improve the efficiency of machinery and equipment.