Had a look at Dutton Park (Sth Brisbane) graves 62 & 63 (portion 4 by the way) and there are no headstones only bare ground. 62 contains Henry Johnson and his daughter Emma (Johnson) Yeo. 63 is Henry's wife Sarah (Woodwards) Johnson and another daughter Eliz (Johnson) Sirett.
Henry and Sarah's children (below) could fit in with Henry being born in 1830 but it is certainly not as good as having a birth year.
1860/BA00324 Johnson John Henry Sarah Woodwards 1863/B001650 Johnson Lucy Henry Sarah Woodwards 1864/B002781 Johnson William Henry Sarah Woodwards 1868/B008253 Johnson Elizabeth Henry Sarah Woodwards 1871/B012070 Johnson Emma Henry Sarah Woodwards 1875/B019974 Johnson Arthur Henry Sarah Woodwards
1866/B006073 Johnson Thomas Henry Sarah Woodward
There is also the 1907 death of a Henry with father William and no mother. There is another 1907 Henry death with father William and mother Martha, so I don't know how you tell which one is at Dutton Park Reg # Family name Given name Father Mother
1907/B008466 Johnson Henry William Johnson -
Did a bit of a look for a Johnson/Woodwards marriage but couldn't see one, so maybe the Dutton Park guy was born/married outside Australia? Or just not recorded.