At my age, if it comes down to knives, I will just sit down, bend over, put my head between my legs and kiss my arse goodby.
Of course, that's for those special occasions. Here are my daily tactical knife handling skills...
Get yourself the full-size Spyderco Civilian if you are sickly, too old, or in bad shape, it is a last-ditch defensive fighting knife, even if you have to fight while taking a beating or on your back.
https://www.amazon.com/Spyderco-Civilian-Handle-Serrated-Knife/dp/B001DZT21O