Yes indeed! With the rule of 72, at 10% per annum, if he was to double his money every 6-7 years or so, by the time he turns 100, 1 trillion is looming? Imagine if WEB had the genes of Irving Kahn, who lived to 110. Just think of that compounding miracle if he were to live that long. Incredible! 99% of his wealth was created after age 65? And 99% of his wealth was all in, LTBH with Berkshire. How many here have the cajones to be all in at 99% like him? I don't blame you for saying, "NOT ME!" Someone said recently they are 95% (I salute you!)...our old friend, Hartmanbirge was 90%. I was 85% last year, and took some off the table at $472 in my Roth and put it into an Intermediate Bond Fund....that brought me down to 79% in BRK....big mistake...should have left it alone or put it into T-Bills. I'm just breaking even in that lot. Now, I'm back up to 82% in BRK. Still have a boatload of BRK in my 401k which I can unload at anytime with no taxable event. Waiting for an exit price, and feel like I'm getting ready to pull the trigger...it's tempting at these prices. If I exit with that lot, I'll be down to 60% BRK, and I'll stop there. That not too inconsiderable remaining chunk is in my taxable brokerage account going way back to the late nineties and will remain LTBH until I'm 6 feet under. Too big of embedded gains for me to ever consider bailing out. It is earmarked for a handful of charities that I care about with a step-up in basis and no tax consequences to my estate upon my demise.