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Einstein published General Relativity when he was 35, and after that he did important work but nothing quite as world shaking as the period 1905-15.

So he may have been projecting his own disappointment into a general statement.

Makes all of us (since we will all be 30+ one day if not alright) happy to know that Einstein wasted a lot of time trying extremely hard to disprove quantum mechanics because "God doesn't play dice with the universe."

Also Unified Field Theory, which has had very little substantive progress since his time.

Well that's interesting. So what does that mean, has to have been published by 30, or just the successful experiment carried out before 30?