In cannon terms he's 8
but since the game that he was released in he is 18
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he used to be 8 years old. now he is 11. (i think)
In Mobius Tails Is 8 Years Old
From what I've found out, Sonic is 15, and Tails is 8 Well, from what I found out, Sonic is 18 and tails is 11, but in the comics he 17 (HUH!?) NN96
Tails is a two tailed, eight-year-old fox. actually,a 2 tailed,yellow, 8-year-old fox.
yes but no one is quite shour