Have never used a kettlebell. All of my "working out" is aerobic walking, the machines at the gym, some light stretching, and the occasional 60-second plank.
My "problem" is that I have to find the gumption to workout, do it all alone, and with some regularity. Is tough because my body is getting "long in the tooth" and is very tall with not much natural strength.
Well, I can tell you my favorite quote.
It's not too late and you are not too old
Even if you are not strong yet, you can build it slowly up. I'm 52 and I worked out online with people who were even older. Start with light weights and start with compound exercises to build up basic strength.
Kick yourself and start today. I use kettlebells because I don't want to be a bodybuilder and build big muscles. I want strength, mobility, and endurance. Therefore kettlebells are ideal for functional strength training.