“There is no significant idea which cannot be explained to an intelligent twelve year old boy in fifteen minutes.”
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Leo Tolstoy 456
Russian writer 1828–1910Related quotes
Source: I'd Tell You I Love You, But Then I'd Have to Kill You

Above three quotes are his remarks as he was from a very well to do land owning family with no wants in but attracted to the plight of thee poor people in page=3
Baba Amte: A Vision of New India

Source: 1970s, Margaret Mead: Some Personal Views (1979), p. 252-253

“Old is always fifteen years from now.”

Source: I am a mathematician, the later life of a prodigy (1953), p. 322; Cited in: Walter F. Buckley (1967) Sociology and modern systems theory. p. 82

“Old age is always fifteen years older than I am.”
Actually by financier Bernard Baruch.
Misattributed