The average age of a public company has been declining for decades: 61 years in 1958, and currently 18 years. No company is immune to the practice. Google isn't going anywhere, but we should be expecting companies to come-and-go more frequently than the past. What's unusual today, and more Google-specific, is that it's one of a few companies absolutely dominating the S&P: just 6 stocks make up over one-quarter of the total capitalization.

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