Anybody devoted to learning and improvement should be able to say their best work is ahead of them no matter their age. Your level of quality over the decades is a function of your personality, not your age.
But it is a hallmark of youth (and managers who know nothing about software) to be naive enough to think that the guy working 80 hours a week must obviously be twice as “productive” as the guy working a 40 hour week. I can sit back and laugh though, those guys will get what they deserve when their projects sink into maintenance hell.
