I am an old number with zero in my tens space. I have a square number less than 9 in my tens of thousands space and half of that in the thousands space. My hundreds digit is 4 more than my tens digit and my ones digit is less than 3.

Answer 1

I assume you mean odd instead of old, so we have
...0{13579}

The 10,000 place is 1 or 4
{14}xxx0{13579}

not 1, since half of it is in the next place:
42xx0{13579}
42x40{13579}
42x401

no idea what is in the 1000 place