Sea Shell

How can I tell how old a sea shell is?

Found a GIANT shell on vaca. How can I tell how old it is or where can i go for someone to tell me how old it is. Thanks in advance.

The average mollusk expands (enlarging it as it grows) its shell every 3 to six months. so if , say a clam is a seedling it will take about one year to grow to about one and a half inches in length. then about half inch every 6 months. If it is a snail , depending on what type , it too grows an average of one to two inches a year. I have a queen conch that measures 9 inches so this particular conch or snail is about 9 to 10 years old.
Some mollusk grow at a slower pace, like scallops it is said that they take 7 years to reach maturity and be able to reproduce. These sizes are about 3 to 4 inches wide or the span of 4 fingers.

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Molde Portugal Serving Plate 85 X 85 Seashells Pink Vintage Good cond
Molde Portugal Serving Plate 85 X 85 Seashells Pink Vintage Good cond
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Vintage Metlox Poppytrail Satin Glaze Pink Giant Clam Seashell Dish
Vintage Metlox Poppytrail Satin Glaze Pink Giant Clam Seashell Dish
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FITZ  FLOYD Omnibus Habitat Americana Caribbean Seashells PLATTER 12 1 4 LK
FITZ FLOYD Omnibus Habitat Americana Caribbean Seashells PLATTER 12 1 4 LK
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Noritake Hand painted Occupied Japan Sea Shell Trinkey Jewelry Candy Dish
Noritake Hand painted Occupied Japan Sea Shell Trinkey Jewelry Candy Dish
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11 1 4 Diameter Erphila Shell Seashell Ivory Czechosovakia Serving Bowl
11 1 4 Diameter Erphila Shell Seashell Ivory Czechosovakia Serving Bowl
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BELLEEK Seashell Cache Pot IRELAND VASE
BELLEEK Seashell Cache Pot IRELAND VASE
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OTAGIRI BLACK W GOLD STARFISH SEA SHELLS W 24 KT SOAP LOTION DISPENSER
OTAGIRI BLACK W GOLD STARFISH SEA SHELLS W 24 KT SOAP LOTION DISPENSER
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VINTAGE ROYAL BAYREUTH LUSTER PORCELAIN SEA SHELL BOWL BAVARIA
VINTAGE ROYAL BAYREUTH LUSTER PORCELAIN SEA SHELL BOWL BAVARIA
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RARE ANTIQUE VAN BRIGGLE POTTERY MULLBERRY CONCH SEA SHELL PLANTER
RARE ANTIQUE VAN BRIGGLE POTTERY MULLBERRY CONCH SEA SHELL PLANTER
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Lovely Salt Fired Doug Dotson North Carolina Pottery Candle Holder w Seashell
Lovely Salt Fired Doug Dotson North Carolina Pottery Candle Holder w Seashell
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Earth toned Ceramic Seashell Display Dish Hand thrown pottery by JD Ceramics
Earth toned Ceramic Seashell Display Dish Hand thrown pottery by JD Ceramics
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Fabulous Large Vintage Seashell Vase Handmade Folk Art Primitive Antique Florida
Fabulous Large Vintage Seashell Vase Handmade Folk Art Primitive Antique Florida
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FOUR Cordon Bleu BIA 725 Sea Shell Design Salad Desert Buffet Plates EC
FOUR Cordon Bleu BIA 725 Sea Shell Design Salad Desert Buffet Plates EC
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Vintage Large Sea Shell Vase No Damage Pottery
Vintage Large Sea Shell Vase No Damage Pottery
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Five Roseville Pottery Mayfair Sea Shell Serving Dish and candlesticks
Five Roseville Pottery Mayfair Sea Shell Serving Dish and candlesticks
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B8 Bing  Grondahl BG Seashell Demitasse Cup  Saucer
B8 Bing Grondahl BG Seashell Demitasse Cup Saucer
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Royal Albert Turquoise Design Pink Inside  Raised Sea Shells Cup  Saucer Set
Royal Albert Turquoise Design Pink Inside Raised Sea Shells Cup Saucer Set
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FITZ  FLOYD FISH MARKET GIFTWARE SEA SHELLS 7 UNDERPLATE ORIGINAL BOX 1992 98
FITZ FLOYD FISH MARKET GIFTWARE SEA SHELLS 7 UNDERPLATE ORIGINAL BOX 1992 98
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Sango China Tivoli 8305 8 Soup Salad Bowls Seashells  Flowers W Case
Sango China Tivoli 8305 8 Soup Salad Bowls Seashells Flowers W Case
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Sango China Tivoli 8305 9 DINNER Plates Seashells  Flowers W Storage Case
Sango China Tivoli 8305 9 DINNER Plates Seashells Flowers W Storage Case
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Sango China Tivoli 8305 8 Bread Plates Seashells  Flowers W Storage Case
Sango China Tivoli 8305 8 Bread Plates Seashells Flowers W Storage Case
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West Coast California Sea Shell Scalloped Vase
West Coast California Sea Shell Scalloped Vase
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Franciscan USA Sea Sculptures Set Of 5 Lunch Plates Conch Sea Urchin Fan Shell
Franciscan USA Sea Sculptures Set Of 5 Lunch Plates Conch Sea Urchin Fan Shell
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VTG PRINCETON CHINA POTTERY NAUTILUS SEA SHELL VASE PINK W FOIL TAG ART NOUVEAU
VTG PRINCETON CHINA POTTERY NAUTILUS SEA SHELL VASE PINK W FOIL TAG ART NOUVEAU
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ANTIQUE FAVORITE BAVARIA HAND PAINTED CERAMIC PLATE W LOVELY SEA SHELL PATTERN
ANTIQUE FAVORITE BAVARIA HAND PAINTED CERAMIC PLATE W LOVELY SEA SHELL PATTERN
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2 Studio Nova BARRIER REEF Cup  Saucer Sets Tropical Fish Mikasa Sea Shells
2 Studio Nova BARRIER REEF Cup Saucer Sets Tropical Fish Mikasa Sea Shells
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Pottery Barn Seashell  Coral Salad dessert Plate
Pottery Barn Seashell Coral Salad dessert Plate
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circa 1900 VICTORIAN 6 Tea Cups  Saucers with Scalloped Sea Shell edges
circa 1900 VICTORIAN 6 Tea Cups Saucers with Scalloped Sea Shell edges
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Large Sea Shell Hand Painted Italian 14 inch Bowl
Large Sea Shell Hand Painted Italian 14 inch Bowl
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FITZ AND FLOYD 10 1 4 SEASHELL 1972 PLATE
FITZ AND FLOYD 10 1 4 SEASHELL 1972 PLATE
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Unique rare clay pot with sea shell top and seal scene inside 4 w 4 t
Unique rare clay pot with sea shell top and seal scene inside 4 w 4 t
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KONNIE KIM Signed Porcelain Seashell Art Tile Framed NOS IOB
KONNIE KIM Signed Porcelain Seashell Art Tile Framed NOS IOB
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GLOBAL DESIGN CONNECTIONS KATE WILLIAMS Sea Shell Beach Sand Dollar Platter 8
GLOBAL DESIGN CONNECTIONS KATE WILLIAMS Sea Shell Beach Sand Dollar Platter 8
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GLOBAL DESIGN CONNECTIONS KATE WILLIAMS Seashell Shrimp Cocktail Dishes Set of 4
GLOBAL DESIGN CONNECTIONS KATE WILLIAMS Seashell Shrimp Cocktail Dishes Set of 4
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BLUE RIDGE CHINA SEASHELL JEWELRY BOX LOVELY
BLUE RIDGE CHINA SEASHELL JEWELRY BOX LOVELY
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Royal Doulton Hand Painted Floral  Raised Gold Cabinet Plate Sea Shell Border
Royal Doulton Hand Painted Floral Raised Gold Cabinet Plate Sea Shell Border
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Fitz and Floyd Salad Dessert Plate Variations Seashells Brown Gray White Japan
Fitz and Floyd Salad Dessert Plate Variations Seashells Brown Gray White Japan
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Vintage Hand Painted Ceramic Pottery Seashell Dish Made in Italy Marked 4606
Vintage Hand Painted Ceramic Pottery Seashell Dish Made in Italy Marked 4606
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2 Coquille Dinner Plates Sea Horse and Seashells Beautiful Hand Painted
2 Coquille Dinner Plates Sea Horse and Seashells Beautiful Hand Painted
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Sakura Coral Reef School Fish Seashells Blue Green Purple Black White Mug
Sakura Coral Reef School Fish Seashells Blue Green Purple Black White Mug
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