Parrots loose feathers on occasion and its not a concern unless its happening in one area (as a result of the parrot plucking them out) or is related to a disease (regular vet visits can rule that out). At least once per year your parrot will also molt which is normal.
The head is the first place a bird will begin to molt. The age of your bird is about that first molt time. They may get grumpy and will need extra calories and protein.
sounds like a molt, feed sweet potatoes they're loaded with vitamin A, and a warm spray bath softens the emerging feathers. they usually get a bit cranky cos they're uncomfortable and itchy.