Middle and low back pain at your age is commonly postural. Loss of lumbar lordosis is common. Step one is having an XRay D/L and L/S spine AP & lateral. Have analgesics for short duration with muscle relaxant. Posture training and physical medicine consultation.
Next Steps
orthopedics and physical medicine consultation of progressive pain or pain hampering daily work, pain and tingling in leg/toe. May require MRI spine and blood assays
Health Tips
your job and its effect on body's biomechanics would also be important to inform to the physician