KQi2 Pro

I have the KQi2 Pro which was, loosely speaking, the predecessor to this one, and it handles moderate hills just fine. Mine maxes out at 18mph flat ground because of a limiter (I'm fine with that) but it clearly has extra oomph for when I go up an incline. I am assuming you are talking 2-4% hills and not anything much much steeper.

I bought a KQI2 Pro this holiday season, not because it had great specs but because it was $360 on sale. I did not have intense needs for it, nor did I have high expectations. It was immediately a huge jump from the Ninebot ES line (two successive scooters) that I'd been struggling with for about 6 years. It is not amazing, but I didn't need it to be fast or to tackle crazy hills/distance. It is just fine for grocery runs or trips to work. It's very nice for trips from Manhattan to the outer boroughs, as it gets about 18-20 miles range from 100% to 0% power and there aren't many places I need to go where I'd have to take it any farther. It's heavy, like most scooters in this category. The KQi Air is probably what I'd really get if cost were no issue. It has the range I need, the ride quality I need, and it's 40% lighter. I have talked to people with other scooters, and Ninebot/NIU are the only game in town. A friend of mine got an Apollo that can't even get out of the apartment without a $200 repair job out-of-the-box.

i dont think they sell it anymore but i bought a niu kqi2 pro for 300 dollars last year and ive put over 400 miles on it about a year

I'm with the other guy that you're really never too old. There's a dude I see riding by in my neighborhood that looks to be in his mid-40s, and the person who I first heard mention the OneWheel is Adam Savage, who is 58 now. That aside, though, I went with a scooter over the OneWheel for practical and price reasons, and I've had mine for around 2 1/2 years now. Mine is a Niu KQi2 Pro. It has generally treated me very well, and I've gotten solid support for the couple of little issues I've had. For your use case, I'd probably step up to a higher end one for a bit more power and range. Also, depending on the quality of surfaces you'll be riding on, you might consider something with solid tires if you ride on very smooth surfaces or with suspension it you ride on very rough surfaces. The KQi2 Pro comes with air filled tires that dampen a bit of impact on the fairly rough concrete I ride on regularly, but it does not have suspension, so it's not necessarily ideal when I manage to catch a big bump.

Between these two I'd go for the Niu without the slightest doubt. No scooter seller/importer/manufacturer is without its fair share of faults, but we know Ninebot and Niu as some of the most reliable. Just, buy from Amazon or some other large store so you can make use of their customer support if you have a problem. Youtube reviews are worthless; the vast majority are paid shills as they have a vested interest to push affiliate deals.

It might not be the upgrade you're looking for, but the KQI3 max is great, way better than my KQI2 pro.