1. A computer-implemented method for determining an age of an object, comprising: at a computer system including one or more processors and memory storing one or more programs for execution by the one or more processors: identifying a first index for a timestamp entry in a sequence of timestamps corresponding to a time at which an object was created, wherein the sequence of timestamps is generated by periodically storing a current timestamp reported by a clock of the computer system into the sequence of timestamps; identifying at least one subsequence of timestamps from the sequence of timestamps having indexes for entries in the sequence of timestamps that are between the first index in the sequence of timestamps and a last index for a last timestamp entry in the sequence of timestamps, wherein the at least one subsequence of timestamps conforms to a function of a time interval between storage of consecutive current timestamps reported by clock of the computer system; and determining an age of the object based on the at least one subsequence of timestamps.