いつの頃ころからか

expression

at some point in the past; at some stage

Used to refer to an unspecified time in the past when something began or changed, often with a sense of vagueness or nostalgia.

• いつの頃ころからか、彼かれは毎まい朝あさジョギングをするようになった。

  At some point, he started jogging every morning.

• いつの頃ころからか、この町まちに住すみたいと思おもうようになった。

  At some stage, I came to want to live in this town.