Other forms: yesteryears
Yesteryear is an extremely poetic way to refer to the past. You might nostalgically talk about the town where you used to live as your home of yesteryear.
The word yesteryear was actually invented by a poet, Dante Gabriel Rossetti, in 1870. Rossetti was searching for an accurate way to translate a phrase by the French poet Francois Villon — the line he came up with was "But where are the snows of yesteryear?" Other translators have substituted yore for yesteryear, but the latter is a word that perfectly captures a kind of nostalgia for a lost past.