It is a bit strange. My 11 year old daughter who weighs 100lbs can squat a bar. I'm not sure but I bet my 8 year old boy who weighs about 60 pounds can do it also. Bottom line, I think it's safe to assume that an overwhelming majority of healthy adults can squat a 45lb bar.
the way I see it, there are other things involved besides strength.
In the case of the squat, you have to have good balance, it's very much a balance move and some people, even those with moderate strength, just do not have it. I have friends who can not do a simple "air" squat, (just go down and up with your arms to the front) For them, a squat with a bar is out of the question, emtpy or otherwise. Squat for them means, smith machine and half ROM, and that's it. No trainer or advice will change that.
Putting the squat aside:
.- OHP is way too hard, I mean, I begin feeling the burn on a 10 rep set with an empty bar.
.- Deadlift with an empty 45 bar is kinda weird
.- Bench is the only one left, putting aside olympic lifts, but if there's no spotter, it is not going to happen either.
No wonder why some beginners hesitate to befriend an empty 45 lbs bar...
Didn't Sean say his wife couldn't bench the bar?
I wonder if she has made some progress since then and if so, how.
)