Ranma is 16 years old. It starts out with Akane and Ranma being 16, Nabiki is 17, and Kasumi is 19. Though no birthday's are celebrated or it's not clearly stated, in an Anime episode Akane does mentions that a year had gone by since Ranma and his dad came to the Tendo Dojo. So gradually by the end of the manga I would say the cast grew up by two years.
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