This property defines approval of Symbols as Unicode in version 10.0 in 2017
Characters like ࡠ,ࡡ,ࡢ, etc. are listed under 10.0 Age.
8518 Characters are present in 10.0 Age starting with the Unicode point U+0860 that represents the character ࡠ.
Currently, as per latest version 15.0.0, Unicode supports 26 number of Age. Here are a few examples - 1.1,10.0,11.0, etc.