It was first believed it was Deepak, but then I believe I either read or heard it was Satish but I am not sure about that. I will research it when time permits. But Deepak is the oldest.
Momma Kalpoe (Ramirz sp?) said in her interview that there was 2 years between the brothers. That is where I get the 19 yo age for Satish. News reports say Satish is 18, Deepak is 21 and that Joran is 17. Joran will be 18 late July to middle August as he has his zodiac sign as being a Leo this is from one of his profile pages that is now gone.
Again Momma Kalpoe pointed out that Deepak 21yo is shorter than Satish 18/19 yo.
I have not heard that Satish attends the same school as Joran. I don't know if Deepak is a college student or not.