The Sea Cadet Corps in the UK caters to young people aged 10 to 18 years. For younger participants, the Junior Sea Cadet sections are available for those aged 10 to 12 years. The main Sea Cadet sections are open to young individuals aged 12 to 18 years. Additionally, those aged from 12 and a half to 18 may join the Royal Marine Cadet Detachments (RMCD) as Royal Marine cadets.
For further details, you can visit the Military Wiki page on Sea Cadet Corps.
Here are some images related to the Sea Cadet Corps:
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