@nerAz: well, i was contacted probably 2-3 months after my medical. got a phonecall from xiangbin (no longer works with SIA) and was informed that i cleared my medical. he asked when do I turn 26. and since at that point in time i was only 24, i was asked to contact them again by email when i'm a month shy of 25 1/2. yup.. hope this helps.
now due to many cadets still 'jammed' at different phases in training, PROBABLY SIA is being stringent on age. For one, i just got my confirmation email. And my OBS date is 2 weeks shy of my 26th birthday. If this is anything to go by, well.. sure looks like they really want to allow only those turning 26 a priority. Of course, this is just a mere speculation. probably you might want to contact those 2 who went for medical with you, their age?