Life is the past. Sure, there is also the exact instantaneous moment that is the present RIGHT NOW, and there is the concept of the future (what will, or could, happen), but for all practical purposes, life is our memories. The way to prolong life, then, is to prolong memories. This can be done in only one way: making more of them; which, in turn, can be done in one of two ways: live longer, or engage in memory making, that is, memorable activity.
Our brains don't slow down or speed up (at least not without external influence, chemical or other). So if the brain takes a certain amount of time to get through memories, then it would take longer to get through more of them, resulting in the perceived extension of time. This is somewhat paradoxical, since actually engaging in the memory making activity typically makes "time fly." Yet, after the fact, say a few months or years later, when we think back to a span of time (hours, days, month, whatever), the periods that time seemed to fly are the periods that are now remembered as longer, more eventful, more memorable than the times when "nothing" was going on. Do your own thought experiment here: remember a courtship, an intensive learning time, a period when a new sport or skill or body of knowledge or relationship was being learned. The time really seemed to pass quickly, didn't it? Now, contrast some of those periods, with known lengths (maybe something took 3 weeks, or a day, or 2 years) to a similar period of time when "nothing" was going on. Which period now seems longer? Most likely, the periods where nothing was going on are merely blips in memory, if they can be recalled at all, whereas the active and engaged periods are filled with vivid memories that take some processing power and time to think about, thereby making those periods seem longer in duration.
The way to prolong life is to spend as many of your 1440 minutes per earthly axial rotation as you can on activities that will create memorable associations in your mind years from now, blasting through the days full throttle, generating years worth of memories and experiences that will seem like they must have taken several lifetimes to accumulate, rather than doing as most people do (especially the older ones with "nothing to do" now that they are retired and their children have long since moved on and they have picked up no hobbies or passions to get them through their remaining decades of life), which is putting life on autopilot, just trying to get through the days, surviving the pain and/or loneliness, and nothing more. The days that take forever to live through, while at the same time resulting in memories years from now of vast stretches of years of nothingness, mere voids on the timeline of life. Bleak? Perhaps. Changeable? Yes!