Am I Balding or Just Developing a Maturing Hairline? One Side Is Slightly Higher Than the Other.

This sounds like a maturing hairline. While it is maturing, it is not unusual for one side to move up slightly ahead of the other side.  It could also be an early recession, but at this stage, I would not worry about it. Just keep an eye on it. If you are really worried, see a doctor with a HAIRCHECK instrument to find out if there is any balding that you can’t visually see. (See here: https://baldingblog.com/value-haircheck-bulk-measurements-two-patients-seen-today/)