About one in five Americans works past the traditional retirement age, according to Pew Research . And billionaire Warren Buffett has proven that it can be quite lucrative to keep working in older age — the 94-year-old Berkshire Hathaway CEO earned close to 95% of his personal wealth after age 65, per Barron's .

Buffett turned 65 on Aug. 30, 1995. At that time, his Berkshire stock was worth about $12 billion (about $25.3 billion today with inflation ). In the three decades since, Buffett's net worth has skyrocketed as Berkshire's stock price has grown nearly 30-fold.

Buffett is now worth $141 billion , according to the Bloomberg Billionaires Index, with 99% of his wealth, or $140 billion of his fortune, tied to his interest in Berkshire Hathaway. The Index places him as the ele

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