OMAHA, Neb. —

Billionaire Warren Buffett warned shareholders Monday that many companies will fare better than his Berkshire Hathaway in the decades ahead because of its massive size, though others might say the company's prospects will dim because “Father Time” is catching up with the 95-year-old icon who plans to step down as CEO in January.

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Buffett reflected on life and his health in a new letter to shareholders where he announced $1.3 billion in new charitable gifts to the four family foundations run by his children that — along with the Gates Foundation — have been helping steadily give away his fortune since 2006.

Berkshire is

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