A bottle-nose dolphin's average life span is 20 years or less.
The age is estimated by examining a sliced section of a tooth and counting the layers.
The oldest dolphin recorded is Nellie from Marineland, Florida. She has reached her 56th birthday as of February 2009. Animals in captivity get better healthcare and therefore live longer.
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a dolphin's life span is pretty long compared to other animals. marine biologists say that you can expect a dolphin to live up to 20 years old. a couple dozen dolphins can live to about the age of fiftty.
The life expectancy of a dolphin depends on the species and where they live. Some bottle-nosed dolphins can live for 40 to 50 years. Other species live for 10 to 15 years.