Aging is a biological not clock process. I assumed you knew that, especially as I said in post 1415:
"GR does allow some to only age 22 hours biologically while going to a calendar date most need 24 hours per day of biological aging to reach."
In earlier posts, I noted that I eat a very healthy diet, never smoked, exercise almost every day, etc. so most guess my age as 20 years less than the number you get by subtracting my birth date from the current date. I.e. there are many simple ways, in addition to what SR makes possible to age at a rate of less than 24 hours /day. (To age more slowly that some like to call "time travel" if done by means of a round trip on fast rocket ship instead of by good diet, exercise, etc.)
Also there are other procedures, which I don't follow, to age faster than 24 hours per day (little sleep, fast foods rich in un-healthy fats, no exercise, diet without fruit, smoking and excessive alcohol drinking).
I forget who* said: "Yes, I am burning my candle at both ends. It will not last the night; but Oh, it gives
such a lovely light."
We all make a choice, perhaps unconsciously, about the rate we age.
If you read (and understand) the physics in this post:
http://www.sciforums.com/threads/time-travel-is-science-fiction.140847/page-71#post-3252458
You will see I have already "time traveled" by the slower rate of aging definition, more than twice as far into the future as is physically possible via SR's time dilation.
And I don't think my time travel journey is over yet, as I am in good health, with excellent mental processes and have about a 25% chance of celebrating my 100th birthday (and that chance grows more likely with every year passing year, if I have not yet died!)
*It was as I recall a musician, with drug use problems and very vulgar speech patterns, - I only cannot recall his name. I liked the guy - sometimes wondering, while spending years to earn my Ph. D., if his was not the smarter choice - we all must die some day.