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Before deciding on care, it is important to know how long a guinea pig lives. The average age of captive guinea pigs is 4-8 years. [1] As an interesting fact, the maximum recorded age of the guinea pig was 14 years.
Source:
[1] Kazimierz Kowalski (redaktor naukowy), Adam Krzanowski, Henryk Kubiak, G. Rzebik-Kowalska, L. Sych: Mały słownik zoologiczny: Ssaki. Wyd. IV. Warszawa: Wiedza Powszechna, 1991. ISBN 83-214-0637-8.