Faramir wasn't a ruling steward- Denethor was the last. I suppose Faramir would have longer lifespan than the common Gondorians because of his Steward descent, but also because of his minor touch of Elven blood through his descent from Finduilas of Dol Amroth.
I think it says somewhere in RotK that it was not common for a man, even of 'purer' blood, to live for longer than five score (100 years), so Faramir had an extraordinary longevity granted to him even for a Steward of Gondor; another example is Elros who lived extremely long even by the span of a Numenorean King.
This may be due to his good deeds and his role in the War of the Ring (look at Aragorn who was rewarded with life longer than most of his forefathers who weren't born in Numenor, for all his hard work in the defeat of Saruon). However, I also think that the Dol Amroth Elven blood factor plays a fairly significant role in this as well.
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Et Eärello Endorenna utúlien. Sinome maruvan ar Hildinyar tenn' Ambar-metta.
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