That isn't an "infantile" question at all.
Firstly, most of the remaining Noldor in Middle-earth (Gildor, et al) had already gone, but it's clear many of the Silvan Elves in Mirkwood were still there, and apparently fairly content.
As for the timing of Legolas's departure, it seems to be connected to the death of King Elessar, who, except Gimli, was the last remaining member of the Fellowship in ME. Legolas seems to have simply felt that was the right time, and there was no further reason to linger in mortal lands.
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