How old are my system statistics?

SQL> select * from sys.aux_stats$;
SYSSTATS_INFO STATUS COMPLETED
SYSSTATS_INFO DSTART 10-30-2008 15:30
SYSSTATS_INFO DSTOP 10-30-2008 16:00
SYSSTATS_INFO FLAGS 0
SYSSTATS_MAIN CPUSPEEDNW 922,832561217737
SYSSTATS_MAIN IOSEEKTIM 10
SYSSTATS_MAIN IOTFRSPEED 4096
SYSSTATS_MAIN SREADTIM 7,109
SYSSTATS_MAIN MREADTIM 16,731
SYSSTATS_MAIN CPUSPEED 896
SYSSTATS_MAIN MBRC 83
SYSSTATS_MAIN MAXTHR 963584
SYSSTATS_MAIN SLAVETHR