One is tempted to say -No!.
However, if I was stuck with some ancient boxwoods, I'd certainly look into sculpting them somehow. That does not mean (although you sure could try it!) carefully examining the heavy trunk material of the tree to see if it resembles anything you recognize and then cutting it to look like it; but it certainly means you could cut up the small wood of the tree out and enjoy the sculpted trunk of your boxwood. Look at the Bonsai sites for beautiful shapes; you'd essentially be making a big bonsai out of your boxwood. This can be lovely, plus a benifit to the animals and birds of the yard who have probably been using the boxwoods for housing. Age is expensive in plants; if you can (CAREFULLY!) cut your boxwoods to accentuate their age it could be really nice and unusual.