Investors worry the bull market is getting old. But history shows it can continue to age gracefully.

Bull markets don't expire on a fixed schedule. While some investors worry that the current rally has grown long in the tooth, historical data suggests longevity alone isn't what ends an advance. Uptrends have, in past cycles, persisted well beyond the point where skeptics began calling them overdue — and the forces that typically end them tend to be specific, not chronological.

What actually matters is the underlying backdrop: the trajectory of corporate earnings, the direction of interest rates, credit conditions, and whether valuations have stretched far beyond what fundamentals can support. These are the variables that have historically marked turning points, rather than the simple passage of time since a market low.

For observers, the practical takeaway is to watch those fundamentals rather than the calendar. A bull market's age is a description, not a diagnosis — and treating it as a countdown can obscure the signals that genuinely matter.