No wonder that my remembrance fails me, for I shall complete my 70 years next Sunday (the 22); — and during these 70 years I have had a happy life; which still remains happy because of hope and content.

Letter of Faraday to Christian Friedrich Schönbein (19 September 1861); see also The Letters of Faraday and Schoenbein 1836-1862 (1899), edited by Georg W. A. Kahlbaum and Francis V. Darbishire, p. 349

The letters of Faraday and Schoenbein 1836-1862. With notes, comments and references to contemporary letters : Faraday, Michael, 1791-1867