Ask him in what way is it worn and to show you what he means. These are very spendy to replace but can be rebuilt by a shop.
They will come up in the classifieds here once in a while. I've seen an entire FJ62 power steering setup go for $200ish- pump, lines, box, even column. Retail outfits will run around $800-1000 for used, $2000+ new.
lots of components lend themselves to sloppy steering, the PS gear box being but one of them. TRE's, drag link ends, steering knuckles, loose wheel bearings, steering shaft wear, worn suspension bushings (did I miss any?) all can be contributors to a loose front end.
often times worn parts are masking others, so best 2¢ would be to start with the component most worn or obviously shot and start working your way through until you've tightened that sucker up.
if your PS gear box is bad (and chances are that if it is still original, it's toast), many local big rig or heavy equipment repair shops can rebuild them for less than $300, a bargain compared to the new OEM part price in excess of $2400.00 (no, that's not a typo) or try James at www.cruiserparts.net. he sells a completely remanufactured unit with a warranty for around $500.00.
My front end has some movement but nothing appears loose(TRE's etc). A Toyota mechanic told me that the steering gear box is pretty worn and that it was not dangerous to drive so if I could live with the movement then I did not need to do anything. He did give me a price for a rebuild, I'll see if I can find it.