The lower hinge on my son’s bedroom door has come loose. As in the screws have pulled out of the wood making it impossible to just tighten them down. How do I fix this since the wood is disintegrating? It’s a solid wood six panel-type door.
Thanks. I suppose this might be an IMHO, but I tossed a coin as I couldn’t decide.
You could try filling the hole with epoxy, coat the screw with soad or oil and let it inside the hole, wait for the epoxy to cure, unscrew the screw, and install the hinge.
or remove the hinge, scrape/ drill any rotten wood out, pack the hole with plastic wood, then drill pilot holes for the screws and re-install the door.
Another vote for Plastic Wood™. That stuff rocks.
Instead of “soad” try soap, it works better 
The posts above are 100% on target. This Saturday, remove the door in the morning and take the hinge off. Pack the weak area with a 2-part epoxy or filler (Bondo has a “home repair” line now). Let it firm up for an hour or so, then drill some small guide holes for the screws that are coming shortly. Re-hang the door with good-quality screws. The repair will likely outlast the door.
Just did the same thing last month. Mine is good, empirically speaking. YMMV.
Try longer or fatter screws
Did this not too long ago myself but I went with the golf tee trick. Fill hole with glue, tap in the tee, cut it flush when dry, drill a pilot hole and voylah.
If your old jamb is really falling apart you can get a brand new, precut door frame kit at Home Depot, or other building supply house.
In cases where the screws have merely stripped the thread in the wood, I drill out and insert a dowel glued in place with epoxy or a good carpenter’s glue. Then drill a pilot hole and use long screws.
If your door is a solid core door it will be heavy. I would use screws long enough to go through the finish door framing and into the rough framing behind it.
Another possibility is to remove the screws from both the wall and door sides, then move the entire hinge about 6 inches higher or lower than it was before, and then drill holes & insert the screws there, in a new part of the wood.
Afterwards, fill the old holes with wood putty, etc., if the looks bother you.
The problem with inserting a dowel or other wooden item is that the screw, when re-fixed, will be driving into end-grain, which is not ideal.
It is possible to purchase cross-grain dowels or pegs specifically for the purpose of renovating worn screw-holes in wood.
A lot depends on how and why the jamb is disintegrating.
If it’s just the wood in the immediate vicinity (like, within a millimetre or two) of the screw hole, then just pack the hole with toothpicks coated in PVA (white) glue, wait for the glue to set, cut off the toothpick ends, then punch a pilot-hole with a nail.
If the door jamb is just generally soft everywhere, try much longer screws that will go all the way through the jamb into the wall studs.
(On re-reading through the thread, I see that David Simmons has already said pretty much the same thing.)
It’s actually the door side where the screws are coming out. I will hit the Home Depot and try the Plastic Wood stuff. Maybe I’ll pick up some dowels or golf tees just in case.
Thanks.
Another vote for the golf tee trick.
I keep a bag of tees for just this purpose. They are hardwood, so I doubt that they are substantially weaker then the original wood (not hardwood), even in their end-grain orientation.
Just squirt a little yellow glue in the hole, put the tee in, and give it a light tap with a light hammer. Don’t go wild, since their wedging effect can split the wood.
Once it dries, I use diagonal cutters to snip off the tees and then a chisel to dress up the short stumps prior to redrilling.
All these fix it types. and no one mentions duct tape ? 
The door frame is most likely a 1 X 6. Use a 2 1/2" deck screws and go through the frame and into the stud behind it.
I have been using another ‘cheat’ technique.
If a screw is coming loose, and the wood is starting to strip, what I do is to take the screw out, and jam in as many matches, or toothpicks, as possible. Then put the screw back, and it normally works better.
I’m sure that it’s nowhere near as solid as using epoxy or ‘plastic wood’, but it’s quick and uses stuff you probably have at home.