Hi Greg,

The = sign has two different meanings, depending on context.

For a statement that starts with a variable or property, = stands for
assignment. The value to the right of the = sign is assigned to the variable
or property to the left.

For all other statements, the = sign means a test for equality in an
expression, and the expression returns True or False depending on whether
the values to the left & right of the = sign are the same.

In the Test macro, the = is an assignment operator, assigning the return
value of the InputBox function to the oAge variable.

In the Test1 macro, things are a bit more complex, but I'll unpack it. The
key line is this

If Not IsNumeric(oAge = InputBox("How old are you in years?", "Age")) Then
GoTo Retry

(all that should be on one line)

Working from the outside in, we have this

If the expression between "If" and "Then" is True, then you Goto Retry

That expression is Not IsNumeric(oAge = InputBox("How old are you in
years?", "Age"))

IsNumeric is True if oAge = InputBox("How old are you in years?", "Age")) is
numeric

But oAge = InputBox("How old are you in years?", "Age")) is an expression
that includes an equality operator, in other words, it is True or False
depending on whether the return value of the InputBox function is equal to
the current value of oAge. IsNumeric(True) and IsNumeric(False) both return
True, which means that the overall expression is always False, and you never
follow the Goto.

But remember that the = sign in this context is an equality operator, not an
assignment operator, so oAge will still be a null string, so the message box
on the following line will always say "You are  years old"