Is it the the "big" feathers (eg. the flight wings) or the small downy white feathers? Are you sure that its a year?
During 8 months it'll start dropping the small downy white feathers. At about 18 months there seems to be another "molt" but this is just another obvious part of the "first" molt. It is easy to monitor the molting progress because of Grey's first tail feathers are edged with slightly black tip.
If its those "big feathers", then I think you should go to a vet instead.