A reader wrote in recently, or at least the question reached me through the usual channels, and it's the kind that deserves a straight answer: when is it too late in life to start investing? The question usually comes from someone in their fifties or sixties who feels like they missed the boat. A piece making the rounds this week takes a swing at it, and the answer history gives is about as encouraging as finance ever gets.

The short version: it is almost never too late. The long version involves some math, and you know I can't resist.

Here's an illustration, and I want to be clear it's my own back-of-envelope calculation, not a promise. Say you're 55, you've got $50,000 saved, and you put away $800 a month in a broad stock index fund. If the market were to average 8 percent annually, roughly what it has delivered over long historical stretches though nobody guarantees the future, that money compounds into several hundred thousand dollars over fifteen years. Leave the same $50,000 in cash earning what cash earns, and it barely moves while inflation nibbles at it. I won't put a precise dollar figure on either scenario, because precise figures are exactly the kind of thing that gets people excited and then disappointed. But the gap between contributing and waiting is real, and it widens every year you give it.

Now the part people forget. Retirements of 25 years or more are increasingly common, which means even someone starting at 60 may have a horizon long enough that the usual rules still apply. Compound interest doesn't check your birth certificate. It just needs time, and you likely have more of it than you think.

Does the strategy change at 60 compared with 30? Of course. You probably hold more bonds, keep some cash, and resist the temptation to swing for the fences to make up lost ground. That last part matters most, actually. The danger late in life isn't starting too late. It's starting too late and then reaching for something risky to compensate. Crypto schemes, options gurus, that cousin's can't-miss startup. The shortfall makes people reckless, and recklessness is how a late start turns into no recovery at all.

I've watched this play out since the late '80s. The people who ended up okay in their seventies were rarely the ones who found some brilliant investment at 58. They were the ones who started something, anything, kept adding to it, and let the boring machinery of the market do the work. Small and steady beats dramatic and sporadic. Every time.

So when is it too late? Genuinely, almost never. Even at 70, money you don't need for a decade belongs somewhere it can grow, not in an account earning nothing while inflation does its quiet work. Ask yourself what your money is doing right now, tonight. If the answer is nothing, the best day to change that was twenty years ago. The second-best day is today.

As always, I'm sharing perspective here, not professional financial advice. Talk to a fee-only advisor about your specific situation. But if you're asking the question at all, you're already ahead of the person who assumes it's hopeless and does nothing.