I suppose the first step in determining what makes wines from old white grape variety vineyards is to compile a roster of the sites which are generally considered to be “old”.
Here are a few I could find via a quick Google search:
• “Alfaro Family Vineyards: ‘Trout Gulch Vineyard’” (1980) - Chardonnay
• “Alta Vista Vineyard” (1930s) - Gewürtztraminer
• “Bacigalupi Vineyard” (1950s) - Chardonnay
• “Betty Ann Vineyard” (1900s) - French Colombard
• “Bridgehead Vineyard” (~1935) - Palomino, Muscat
• “Carlisle Vineyard” (1927) - Albillo Mayor, Clairette Blanche, Grec Rouge, Mondeuse
• “Casa Santinamaria” (1890s) - Muscadelle
• “Cat Canyon Vineyard” (1978) - Chenin Blanc
• “Chalone Vineyard” (1919) - Chenin Blanc
• “Chappellet Estate Vineyard” (>1960s) - Chenin Blanc
• “Cole Ranch” (1950s) - Riesling
• “Compagni Portis” (1954) - Burger, Gewurztraminer, Riesling, Trousseau Gris, etc.
• “Deaver Vineyard” - Muscat of Alexandria
• “Evangelho Vineyard” (1890s) - Palomino
• “Fanucchi-Wood Road Vineyard” (1906) - Trousseau Gris
• “Gibson Ranch” (1910s) - Grenache Gris
• “Hoffman Mountain Ranch/HMR Vineyard” (~1964) - Chardonnay
• “Jackass Hill Vineyard” (1890) - Muscat
• “La Boeuf Vineyard” (1974) - Chardonnay
• “Mancini Ranch” (1922) - French Colombard, Muscadelle, Palomino
• “Monte Rosso Vineyard” (~1886) - Semillon
• “Nelson Family Vineyard” - Riesling
• “Nervo Ranch Vineyard” - Burger, Chenin Blanc, Sauvignon Blanc, Semillon
• “Nichelini Family Vineyards”: ‘Rose Block’”] (1946) - Muscadelle/Sauvignon Vert
• “Oakville Farmhouse Vineyard” (~1930s) - Colombard, Chenin Blanc, Malvasia Bianca, Semillon
• “Old Hill Vineyard” (~1885) - French Colombard, Chasselas, Clairette Blanc, Muscat
• “Pagani Ranch” (1880s) - Muscadelle
• “Papera Ranch” (1934) - Trousseau Gris
• “Peter Martin Ray Vineyard” (1982) - Chardonnay
• “Raffaini Family Vineyard” - Chasselas
• “Rochioli Vineyard” (1959) - Sauvignon Blanc
• “Saitone Ranch” (1890s) - Muscadelle, Palomino
• “Shell Creek Vineyard” (1971) - Chenin Blanc
• “Stony Hill Vineyard” - Riesling
• "To Kalon Vineyard: ‘I-Block’" (1945, Stelling property) - Sauvignon Blanc
• “Two Acres” (1910s) - Helena
• “Vista Verde Vineyard” - Chenin Blanc
• “Wes Cameron Vineyard” - Colombard
• “Wirz Vineyard” (1902 & 1964) - Riesling (1964), Orange Muscat (1902)
• “Wright’s Vineyard” - French Colombard
• "Yamakawa Vineyards: ‘Shot-Wente Block’” (1968) - Chardonnay