First, the ears should not be touching in the middle. Forcing them to
touch creates and unwanted crease in the ear which will tilt the ears out
so I would say in the young puppy, 1/2 inch gap is appropriate and as they
grow that gap will probably increase to an inch or more.
Second, all ears are not created equally. It is not the actual ear, it
is the ear hole and where it is situated on the head. If you have a ear
hole set high, the ears will be closer together and set higher on the head
and the reverse is also true, if the ear holes are set lower, there will
be more space between the ears.
I have found that the break in the ear should be set with the tape at
the half way mark because when you take out the tape, the ears will
lift up a trifle making the break in the ear a 3/4 break.
The ears are set when the adult teeth are all the way grown in, at
about 6 months. You can still try to correct an ear set up to a year
or more. I would say at 2 years, what you see is what you've got.