What's with the age change?

Just watched the Netflix doc that showcased the 60 min interview that was recreated at the end of ACV. In both there's the question about her age and whether she's 26 or 23 and she goes into how she has multiple birth certificates. What is the deal with that? Did she want to be considered older or younger? I know it's hard to rationalize anything from a pathological liar, but was there any reason for this?