Indeed in French we use 'avoir' for thirst and hunger and also for ages.
Ils ont vingt ans, cette année.
(They are twenty this year.)
Le chat a soif.
(The cat is thirsty)
Nous avons faim, quand est-ce qu'on mange?
( We are hungry when are we eating?)
Hope this helps!
Yes. Because faim and soif are feminine nouns, so it may be more suitable to use avoir, instead of etre, that should be followed by an adjective to describe the subject
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