Yes there is an issues it’s not as simple at this age lysthesis may progress

You have a small disc bulge at L4–L5 and a very mild forward slip (Grade-I anterolisthesis) at L5–S1 due to pars defect, but importantly there is no nerve compression, no canal narrowing, and no fracture. This explains pain and stiffness while standing, but it is a stable and manageable condition, not one needing surgery. Symptoms usually improve with posture correction, activity modification, core strengthening, and short-term medications. You can stay active, but avoid heavy lifting, bending forward repeatedly, and prolonged standing for now.

Mild issue Not very serious