A lightweight cordless battery mower would likely be the best option for you, as they are much easier to start and maneuver than petrol models. While self-propulsion can help with the effort of pushing, it does add overall weight to the machine; whether it's necessary will depend on your lawn's size and terrain, such as hills.

To find the perfect match for your needs, please use my selection tool here: https://easylawnmowing.co.uk/find-the-best-lawnmower/. Just enter your requirements, and a shortlist of the best-suited mowers will be generated for you.

If you have any questions let me know
Mark