A theme for WordPress is sort of like the outfit & accessories you’re wearing. The body underneath is the same, but it can radically change the way you look. To continue this analogy (simile?), you might want to get your clothing altered to fit you better, which is to say,
Website Redesign – How Often?
This is like that old joke about the poker game – If you look around the table and don’t see the patsy, well…you’re the patsy. If you think it’s time to redesign your site…it probably is. My gut instinct as I write this