WHAT WE WISH WE KNEW AT 30 | FROM OUR GENERATION #69

What do you know now that you wish you knew at 30? The question sounds soft until you try to answer it honestly.

Health compounds in one direction. The damage done in your 30s and 40s cannot be fully reversed in your 60s. Smoking was the obvious destroyer a generation ago. Today it is high-potency THC, which causes permanent brain damage in teenagers and is being sold by an industry whose tax revenue has made state governments complicit in the harm. Lower body strength is the single best predictor of longevity in older adults. Bones grow stronger under stress and weaken without it. Weight-bearing exercise is not optional after 55. GLP-1 drugs are transforming lives in the short term, but the long-term side effects are not yet understood. If you can lose weight through diet and exercise, that remains the better path.

Relationships outlast logic. Never use the words "never" and "always" in a dispute. The moment you do, the argument stops being about the incident and becomes an indictment of the person. You cannot take back the spoken word. You can apologize for it, but it lingers. Harry Truman wrote furious letters he never sent. That discipline is harder than it sounds and more valuable than most people realize. Respect is not a feeling. It is a practice. If you do not respect your partner's judgment, remember that you were one of their choices.

Engineers enter the world believing reason solves everything. It does not. Relationships take priority over logic in every organization. Brilliant people need to be managed differently. Elon Musk's ability to solve problems disappears the moment you pull him into something unrelated. Focus and sensitivity are a tradeoff. You cannot be deeply engaged in solving a problem and simultaneously attuned to the people around you. Managing that tension, rather than pretending it does not exist, is what separates good leaders from smart ones who fail.

Naive realism is the belief that you see the world as it is. You do not. Two people can observe the same event and arrive at opposite conclusions, each certain the other is wrong. The Dunning-Kruger effect compounds this: people who understand the least overestimate what they know the most. A scout mentality, one that actively seeks information that might change your mind, is more effective than a lawyer mentality that defends what you already believe. Warren Buffett's partner Charlie Munger built a career on the willingness to reverse a position when the evidence demanded it.

Strategy is not only what you will do. It is what you will not do. Southwest Airlines succeeded for decades by explicitly refusing to handle baggage transfers, serve meals, or assign seats. Every refusal reduced cost and reinforced focus. Most businesses never articulate what they will not do, and the mission bleeds outward until nothing is executed well.

Government operates on the opposite incentive from every point above. In the private sector, inefficiency kills you. In government, inefficiency grows the budget and the headcount, which increases the manager's compensation and authority. A product that eliminates 90% of the workforce in a government function will be rejected, not because it does not work, but because it works too well. That structural reality is the single most important thing to understand about why government grows and rarely shrinks.

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