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The absence of that threat would have made Thranduil less freaked, so he may have engaged in some kingly visitation to Men and Dúnedain (whom he's not really pissed off at), but perhaps left his son at home, not only to have someone in charge, but to keep his only child safe within Mirkwood's borders.

However, he may have known him decades ago, before the Necromancer's influence began to really take hold in the forest.

Given how crazy isolationist Thranduil acted, it does seem odd that he would particularly know Arathorn.

He says he knows/knew Arathorn, and it's an easy assumption that the son of a good man could be even better.

Regardless of his age, under what circumstances does Thranduil know Aragorn well enough to comment on his character, but Legolas doesn't know him at all?.

My guess is that, after what Legolas said to him (refusing to obey, defying him), Thrandruil was a little pissed at him and sent him on a Snipe Hunt.

That would make him 27 circa the Hobbit trilogy by the film series' reckoning. There's no Time Skip in the film version of The Fellowship of the Ring, and it is mentioned that Bilbo carried the One Ring for sixty years. In the Extended Edition of The Two Towers, Aragorn reveals to Eowyn that he's 87.

There's some time alterations in the film adaptations.

Except that according to the timeline, Aragorn is supposed to be 10 and living in Rivendell at the moment.

Thranduil references Aragorn, telling Legolas to go after him.

The Hobbit: The Battle of the Five Ar download the new version for apple