I usually have chronological landmarks in my memories, allowing me to extrapolate my age. After I've recalled a memory and made my analysis, it will usually be recalled the next time with my previously-determined time stamp.
or
.pmats emit denimreted-ylsuoiverp ym htiw emit txen eht dellacer eb yllausu lliw ti ,sisylana ym edam dna yromem a dellacer ev'I retfA .ega ym etalopartxe ot em gniwolla ,seiromem ym ni skramdnal lacigolonorhc evah yllausu I