A human's average lifespan can be between 70 to 80 years. A whale's lifespan can depend on its species. However, a long living species is the blue whale that can live between 70 to 90 years. For this species, one human year is approximately equivalent to one whale year. Other species can have life spans that are between 30 and 50 years. So, comparing human to whale life spans for this species would be that nearly two human years is approximately equivalent to one whale year.
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Sharks do not have a fixed conversion rate for their age compared to human years, as different shark species have varying lifespans and growth rates. However, a general estimate is that one year in a shark's life could be roughly equivalent to 15-20 human years, depending on the species. This estimate is based on factors such as metabolic rate, size, and life expectancy of the specific shark species in question.
Either five or eight or ten for their first year. There seems to some debate over this...