First off, happy birthday to you! My father turned 86 earlier this month, so you are still a young man!
I've been looking at the Super 8 150s for a while. Seems to me an excellent scooter for the price. However, in my mind, I am back and forth between that and a Yamaha Zuma 125, or one of the new Honda ADV150s (significantly higher price, but also many more features).
The Yamaha and Hondas are both fuel injected. Wonder why you consider carb a plus. Fuel injected mileage is significantly higher.
You also say you consider air cooled a plus. I think the Zuma is also air cooled, but the Honda ADV is liquid cooled. Again, just wondering your thoughts here. As a first-time scooter shopper, I am always eager to learn from the experiences of those on this board.
Finally, regarding speed, I would think the Super 80 is going to top out around 60 mph "actual speed" though the speedo on the bike might read a bit higher. I think the Zuma 125 is similar, while the Honda ADV 150 might get close to 70 mph. 60 is marginal for freeway riding, IMO, but might be OK for a short distance.
Good luck with whatever you decide on. And stay safe!