For your age it is mostly due to repeated stress to spine like bending down and working, lifting lot of weight or prolonged sitting without proper back support. I would advice you to avoid all this, get physiotherapy ( IFT, Spine strengthening exercise) and most importantly rest. Since you have numbness it is best you try bed rest for 2-3 weeks may be upto 6 weeks depending upon improvement of symptoms. Your problem will mostly resolve by then.

If numbness is there, than better to get mri Xray is not helpful