One Of The Glorious Joys Of Growing Older

 Pretty much, it's going to be your back.

No matter how carefully you lifted heavy (or light) things, no matter how well you took care of your physical shell via diet/nutrition, it's going to be your back.

And it will creep up on you in the most diabolical way. You'll be doing some innocent, innocuous task such as cleaning the garage and when you go to move the table saw, something you've done at least a hundred times over the years, you'll pivot in a way that causes your back to twinge...

That is, If you're lucky it'll only be a twinge.

Most likely it'll be a complete freeze up of your lower back that  will have you walking like a ninety-year old curmudgeon, every step carefully taken, one hand on your back, the other on whatever is close to gain support from.

So there you go, one of the joys of growing older.

Enjoy.