Question 1196003
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In  English  Math literature as textbooks etc.,  they  NEVER  use the form  " four times older ",  since it is ambiguous in  English.


The only form  " five times as old as "  is acceptable,  instead,  when you write/compose a  Math problem for wide audience.



For more information,  see the link


https://english.stackexchange.com/questions/221323/has-the-illogical-three-times-bigger-replaced-three-times-as-big-in-common-u