time has been good to you 你看起来还那么年轻（岁月饶人）

与老友久别重逢时可以说：
You haven't changed a bit.  你一点也没变。（很尊敬的说法）
You lost weight. 你看起来瘦了。
You're exactly the same. 你一点没变。
You're just like the day I fell in love with you. 你跟我当初爱上你时一样美。

如果朋友从国外归来：
Well,it looked like Ireland really suited you. 看起来你在爱尔兰过得不错。

如果朋友的变化很大：
I wouldn't have recognized you. 我差点没认出你来。