The Pacific Coast Highway curling toward Bixby Creek Bridge as the ocean turns gold, cliffs falling away into the surf, there's a reason California has been the place people start over for a hundred years. Singles past 50 here have already reinvented themselves at least once, and the fifties are often a quiet third act. However you arrived at this (a marriage that ended, a long stretch on your own, late loss), the state makes room for it.
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For a first walk, LA members favor Griffith Observatory at golden hour or coffee in Los Feliz. The Bay Area has Crissy Field and the Lands End trail, both flat, both easy. San Diego regulars use Balboa Park or La Jolla Cove; Sacramento couples often start at McKinley Park or Old Sacramento. If you both want a longer day, Big Sur and Highway 1 are still worth the drive.