my mother would give my brother and I $10.00 each...
You're not old.
If you were old, $10 would have bought a week's groceries.
When I first went away to boarding school I was 7 1/2 and it was 1975.
We had Tuck Shop on Thursday and Sunday. On Thursdays we were allowed to spend 5 pence and on Sundays, 7 pence.
No idea what that would have been in NZ$ then, but it was enough to buy quite a lot if you were careful and bough chews that were 2 for a penny etc. Also, you could get half a Mars Bar for 7p.
In current NZ$ that is 11c and 15c respectively.