As a lifelong audiophile and music lover (aged 70) my system is the best ever, has recently been upgraded in a major way, and will undoubtedly get better in time, as long as I can hear and function. How we age is a factor of how we care for ourselves (diet, exercise, etc) and many live full lives into their late 80's and beyond. Thus, the 'last upgrade' is a completely individualistic issue. An interesting read is "Younger Next Year" by by Chris Crowley and Henry S. Lodge, available in paperback on Amazon. I highly recommend it.