Hi,
I hiked with my then 8 year old son from High lead Carpark, up the High lead incline and onto Ada 2 mill site, lunch, then onto Starling's Gap in a day in March. Next day we headed down to Big Pat's, which was easy downhill.
Apart from the High Lead ascent (which you haven't mentioned as part of the trip), there was nothing too challenging in the hike.
I would think the hike from Starling's to cross roads (near Ada 2 mill site) wouldn't be a problem.
The distance is about 8km for that section.
I've not walked to the Ada tree yet, so can't comment on that part of the hike.
Water available at Ada 2 mill site (Ada river just in scrub near camp platforms) and it's only about 500m south from the cross road.
At Starling's, if you walk a few hundred meters on the track to Big Pat's (cross roads from Starling's and you'll see the sign to Big Pat's) there might be water flowing under some board walks that you can collect and filter. When we walked from Warburton to Starling's a month ago, there was water flowing there and it looks like it must be pretty much all the time given the boardwalk. However, if you're driving/starting at Starling's, you'll probably have water there...
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