Now it all makes sense

Me too.

But ... If you're older than him how could you still get yours and he couldn't ?
If anything he would still get his as they probably made new lists of new born muggle wizards.

Well cuz he would have gotten his by now wouldnt he hes 15

That is true, but you should be about 19 if you were born in 96, so even if they recovered their previous list you would still be too old to get a letter too.

True true they need some kinda higher education like wizard college

Ahem... look above your comment. Like... directly above.