Quick answer
Wild harbor seals typically live around 30 years, though predation, disease, and habitat quality shift the average.
Lifespan in the wild
Most harbor seals reach roughly 30 years under natural conditions. 25–30 years
Factors affecting longevity
Predators, disease, food scarcity, and human pressures all shape survival. Males and females may differ in average lifespan.
In captivity or as pets
With veterinary care and steady nutrition, harbor seals sometimes live longer than wild averages — though wild longevity reflects natural ecology.
Oldest recorded individuals
Long-lived harbor seals are rare in the wild; research and zoo records help set upper limits for the species.
Sources
FAQs
How long do harbor seals live in the wild?
About 30 years on average.
What affects harbor seal lifespan?
Predation, habitat quality, disease, and food availability.
Do harbor seals live longer in captivity?
Often yes, when nutrition and healthcare are consistent.
How can you tell a young harbor seal from an adult?
Size, markings, and behaviour change with age — see our full profile for detail.