How old are seahorses when they adults?

Seahorses reach adulthood at different ages depending on their species. Some species, such as the dwarf seahorse and the pygmy seahorse, reach adulthood in as little as 3–6 months. Other species, such as the lined seahorse and the pot-bellied seahorse, may take up to 2 years to reach adulthood.

Here are some specific examples of the age at which different seahorse species reach adulthood:

- Dwarf seahorse (Hippocampus zosterae): 3–4 months

- Pygmy seahorse (Hippocampus bargibanti): 5–6 months

- Lined seahorse (Hippocampus erectus): 8–12 months

- Pot-bellied seahorse (Hippocampus abdominalis): 1.5–2 years

- Saddleback seahorse (Hippocampus hippocampus): 1.5–2 years

- Spotted seahorse (Hippocampus kuda): 1.5–2 years