Novak has aged better than Roger or Rafa, but not that much better. He isn't markedly better relative to the field than Roger was in 2019 at age 37-38, his last full/healthy season - and the closest age comp to Novak in 2025. Roger made a Slam F, SF, QF, and 4R. So far Novak has made three SFs. He's not done, obviously, but barring a sweep of WIM & USO, the overall results are close.
Roger also won a Masters and reached the final of another in 2019. Novak has reached a final, but otherwise gone out early. Again, we've still got almost half a season, but we're still talking roughly similar levels relative to the field.
The point being, as a player Novak in 2025 is similar to Roger in 2019. The final results might end up being a bit different, but some of that is circumstantial.