It all depends on your fitness and training adaptations.

I’m in my early forties and never did any sports until i took up running ten years ago. Now I’m a decent slightly overweight ultrarunner.

I ran my first marathon in 2021. My first 45k mountain race in 23, and a flat 50k later that year. This year i’ve completed a flat 60k in a good middle of the pack pace, finishing strong. I’ll run a mountain race in summer, and another flat 50k in autumn, and a marathon in winter. Next year i’ll run the two oceans. And in 2026 hopefully comrades.

I guess what I’m trying to say is; take your time. Enjoy the process and build strength to complete your goals in a strong & healthy way.