I would caution the OP Not to just jump blindly on the "Get a zero turn" bandwagon. (This will upset the "ZT True Believers," but I can't help that.)
And I speak from some experience, having tried to make the Ryobi electric 42" inch zero turn mower work for our two acre property, for a season. It failed miserably, despite my following battery "break-in" procedures religiously. It would only cut for 76 minutes. Admittedly, I let our lawn get high before I cut it and I expect a lot out of my mowers. Also, 76 minutes would be more than enough for the OP's property.
Rather, my concerns are about the OP's SAFETY. The Ryobi ZT pulled an unexpected "wheelie" on me, when I went just went a couple of feet up a slight rise in our property. (And while technically a senior citizen, I still ride dirt bikes, although I do not wheelie them, so I am not completely enfeebled. Not yet, anyway. LOL)
The Ryobi also lacks a ROPS (Rollover protection structure). I feel that Ryobi's failure to offer a ROPS is just a lawsuit waiting to happen.
Also, as was mentioned, ZTs suck on side hills. A lawn or garden tractor is much more capable--and safer--on side hills, than a ZT.
And despite my ability to operate our Kubota B3000 tractor/loader/backhoe, with it's nearly 8 foot backhoe, I think someone new to zero turns might find the "twin sticks" a bit of a challenge, at least at first. I know I did not enjoy having both hands busy the whole time, as I did not have a free hand to hold a cigar while mowing. LOL
I do second the suggestion for a mower with power steering, as we are all getting older. Also, if someone were to have a temporary arm injury, with power steering they would still be able to mow, one handed, which might not be possible with a non power steering equipped mower.
My suggestion would be to do some research on
https://www.tractorbynet.com/forums/ and/or
https://www.greentractortalk.com/, both of which have forums for riding mowers. (There may be more non-green brands discussed on TBN than on GTT--I'm not sure about that.)
I
would consider one of Ryobi's electric riding mowers that is NOT a ZT, like this one, which I believe also comes with a 38" deck, instead of the 30" deck pictured here:
https://www.ryobitools.com/products/46396053602 (This is also similar, stylistically, to the venerable Snapper RER folks keep talking about.)
Ryobi also has some conventionally-styled lawn tractors that are electric, that I know nothing about but just saw myself--and IMO, they're just too ugly to consider. But that's just personal taste.
The nice thing about an electric mower is the near lack of maintenance required. Plus the fact that you never have to worry about your gasoline getting old or your mower failing to start. We just have too much property for an electric mower to work for us, although we do have a self propelled, 20" 40 Volt walk behind Ryobi electric mower that has served us very well and taken a lot of abuse.
And while I have never owned a John Deere product, I have read a lot of very satisfied reviews of there lawn and garden tractors on Green Tractor Talk. Their parts support seems to be particularly robust, as owners claim they can still get parts from machines built back in the 1980s.
I do like our 2005 Cub Cadet 1554 SLT, but it's 27hp and 54" deck would be overkill. And the steering components are rather cheaply made, with plastic bushings that wear out and require renewal, resulting in a higher steering effort then one might expect. Also, apparently the Kohler "Courage" V-twins also had a lot of problems compared to the Kohler "Command" V-Twin in our example. But again, that machine would be overkill for the OP's half acre.
As much as I love the internal combustion engine, as time marches on, if you could make an electric mower work for you I think you would be happier in the long run. They just don't work out well for me, as riders.