Lloyd Kahn of Bolinas runs through Windy Gap during the 2004 Dipsea Race. Kahn, now 90, is entered into this Sunday's Dipsea. (Alan Dep/Marin Independent Journal)

Lloyd Kahn of Bolinas photographs runners just before they come to the hill known as "Insult" during the 96th running of the Dipsea Race in 2006. (Alan Dep/Marin Independent Journal)

Show Caption 1 of 2 Lloyd Kahn of Bolinas runs through Windy Gap during the 2004 Dipsea Race. Kahn, now 90, is entered into this Sunday's Dipsea. (Alan Dep/Marin Independent Journal) Expand

Lloyd Kahn made a promise to himself 16 years ago, and now he aims to keep it on Sunday.

“I decided to run the Dipsea Race when I was 90,” said Kahn, who has challenged the race 19 times in the past and earned 10 black shirts. His best result came in 2

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