Is it safe to take Accutane for years at a time?

I'm a 20 yo male and I've been on Accutane probably since I was 13 or 14, before I ever got bad acne. The reason I went on it was because my sister and mom are both on it and my mom figured why not go on it before I get acne outbreaks so that I don't get them (I never did, just the occasional pimple). Anyway for the past few years I've just been taking a 20mg dose twice a week and my skin has stayed clear which I'm thankful. My question is can I keep this since I'm not having severe reactions?

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