The phrase "prime years of one's career" refers to the period in life when someone is at their peak professionally. It represents the time when they are most experienced, skilled, and successful in their chosen field. Full definition
Muhammad Ali didn't just float like a butterfly and sting like a bee, he also lost 3 and a half prime years of his career while fighting the draft as doggedly as he did Sonny Liston. (entrepreneur.com)
Krychowiak is bigger and more physical and tenacious with the same defensive capabilities as Coquelin, and he is entering the prime years of his career, and similar to coqelin he enjoys the role of the enforcer... this would be a tremendous buy if it actually goes through, and would finally release Arteta from the DM role once and for all. (justarsenal.com)
Vidal is now entering the prime years of his career which, for one school of thought, would make him a solid investment — but is is not the kind of signing that United have traditionally had success with. (caughtoffside.com)