Rubber isn't like fine wine.... It doesn't get better with age.
I'd consider the control arm bushings as junk... I don't care how it feels or looks. It wouldn't make sense to use them on the hope that they wouldn't tear up after a few months.
The other stuff is still very usable. All the rubber boots do is contain grease and keep crap out, so even if they failed, it wouldn't be the end of the earth. If they are still soft, I'd consider using them.
They aren't anything special though... I think Jamco "Magic Power" was a supplier of lower cost components. I can't find any history on them, although there is a Hot Rod suspension supplier of questionable quality that uses the same name.