Ten year old, probably not. 30 year old, and it becomes possible - some of those (per http://appliancecalculator.stanford.edu) wind up using over 2000 kWh/yr. Of course, if the 10 year old one is in not-great repair, that probably increases its energy use (think a poor seal, funky motor, clogged whatever), and leaving it be might well cost more than replacing, and the real question being between replacing and repairing.