Why cannot start with numbers?

Answer 1

A syntax definition directly heritage from c derived languages.

Long response:
In deep compilers use a lexical corpus for identify vars this is the reason how compiler detects you custom named vars. This works with rules to identify vars, numbers, strings.
See what happen is var started with a number.

if - 1 - number - is a valid variable name hence:
1234 - is a valid var name, looks like
1234 = 1111 - this line is strange

But 1234 is a number this is ambigous and compilers will be break.

For this reason var not start with a number

Answer 2

because its a rule

Answer 3

Because you can\ 't
😊😊
They can\ 't make more easy😄

Answer 4

just give the awnser