Separation Anxiety in my Goldens

Question
I have two Goldens, one 6 years, one 5 years, and just in the past year they have started getting very anxious whenever they are left at home when my husband and I go to work.  They have chewed the door frame, the BBQ cover, dug holes, pulled down a section of chain link fence.  We've had to install an invisible fence because they started escaping quite often (they'd dig under the fence, jump over, or actually pull the fence down).  Recently we've put the 5 year old on Clomicalm to help calm her down, as she seems to be the one to start the trouble.  
How do we deal with our otherwise wonderful pets?  Is it too late to crate train them?  They have always been outside dogs when we are not home.
Thanks so much.

Answer
I am a big fan of crates, but 5-6 is awfully old to start.  You would need at least a 36'' crate for them, and something like the Pet Porter would run $60-80 each.  I guess you could try.

A dog that has not been crated since it was little, may take some work.
Start out just putting its toys and treats in the crate.  Praise it for going
in.  Feed it in the crate.  This is also an easy way to maintain order at
feeding time for more than one dog.

The "shut the puppy in a safe room" is a fallacy.  Very few houses even have a
safe room.  How many of us have a room with a hard surfaced floor and nothing
else?  Most rooms have electrical cords to chew if nothing else.  In addition
to destroying anything a bored puppy finds to chew, it may choke or have
intestinal  blockage from the pieces.  I had a friend that left her dog in a
"safe" room.  It ate a hole in the floor covering.  The safe rooms fail to
give the dog the comfort of the enclosed space their instinct requires.  Nor
do they restrict activity extending the time the dog can go without relieving
itself.

There is also the tie down.  Some older dogs adapt to them better than crates.  It is just a short length of chain with a snap.  It restricts the dog without enclosing it.