I changed my resume around depending on whether the position I was going for was more code-based, more supervisory/managerial, more process-oriented, whatever. However, I was not in the same actual job for almost 15 years; I probably had five different jobs (at the same company) in 15 years (and at least a dozen more at five companies earlier in my career). If previous positions really don't add much to what you offer this position besides inferring that you're an "older" worker, I'd be tempted to minimize them or even omit them.