I am attempting to calculate the number of minutes have passed from a saved DateTime and today(), how do i make this happen?

Make use of this:

SELECT UNIX_TIMESTAMP() - UNIX_TIMESTAMP(datetime_col)

Make use of the [cde] built-in function:

TIMESTAMPDIFF()

You might want to swap the datetime values to obtain the right sign (positive/negative) around the result when the column is before/after "now".

Just look for SELECT TIMESTAMPDIFF(MINUTE, my_datatime_col, now()) function in MySQL paperwork.

One of the ways is applying the UNIX epoch (according to rkosegi and Holger Just)

TIMEDIFF