If your Q refers to your size:
As I remember it, height alone is not a restriction
It's more to do with
1. Functional reach. Can you reach all the switches you need to
2. Ejection seat limits. These may be sitting height, sitting thigh length, weight etc. Basically so you're not going to hit anything on the way out.
There is a max & min weight. Minimum cos your body has to be able to withstand the ejection force & max so you can meet conditions for your chute to open. Seem to rememer nude weights of 95 kg for a zero/zero facility & 105 kg for zero/30
I am/was 6' 3" & was 98kg - A litle shorter & heavier now, sadly