I was at the open day in Sydney last week, and someone asked them if there was an age limit. The recuitment officers said that there was not, and it was more about who you are.
I'm sure if you got through last time, you'll get through again. Just explain the reasons, and I'm sure they'll understand.
You have to tell the truth. They will ask you if you have been interviewed by EK before, and they have all your records on file, so will quickly find out anyway.