隔かく世せいの感かん

expression, noun

feeling of being in a completely different era; sense that the world has changed dramatically

Used when something makes you feel as if you have stepped into another age, often because of rapid social or technological change. Commonly appears in the pattern 〜に隔世の感がある.

• スマートフォンの普ふ及きゅうには隔かく世せいの感かんがある。

  The spread of smartphones makes it feel like we're living in a completely different age.

• 祖そ父ふの話はなしを聞きくと、隔かく世せいの感かんを禁きんじ得えない。

  Listening to my grandfather's stories, I can't help but feel that the world has changed dramatically.