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昔懐かしい， 昔なつかしい， むかしなつかしい
1. reminiscent of the good old times, nostalgia-inducing
令人想起美好的旧时光，令人怀念
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大昔， おおむかし
1. ancient times, prehistoric times, the distant past, a very long time ago
远古时代、史前时代、遥远的过去、很久以前
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昔， むかし
1. the old days, the past, former times, a long time ago
2. the past ten years, the past decade
从前，很久以前；过去十年，过去的十年