So here is a real life example: I have 60 points, putting me at Emerald Level. My kids were actually with me for 49 of those accumulated nights. My older son who is now 20, retains my Emerald level, but has 49 points. In order to move to the next level, he will need to earn up from 49. My younger son is only 15. If I move to the next level (Diamond) before he turns 18, he will retain my diamond status but will only be credited with the nights he actually sailed with me and will then need to earn up from there. My older son will not be credited with my diamond status since he is over 18. Hope this makes sense!