Here are my latest podcast recommendations to learn Spanish:
Español con Juan, Español Espontáneo, Españolistos, Hoy Hablamos, No Hay Tos, Se Habla Español.
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Would you say these are appropriate for teenagers? (13-14 are the age I teach)
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Sorry, I haven't listened to them extensively enough to tell. They are podcasts that are geared towards learners though, so I doubt they would use swearwords or talk about adult topics.

