Flaw in IC naming convention

Let say My IC number is 800613-xx-xxxx… i’m born in 1980 My baby IC number is 070830-xx-xxxx …she born in 2007 My grandchild IC number 340830-xx-xxxx … born in 2034 How about if  my super grand child born in 13 June 2080 and I have longer live? My super grand child IC number would be…