Well, as long as you have all the legal documentation for these changes the shouldn't be a problem.Does affidavit in name or in age create trouble in terms of immigration?
More specifically, I am going to change my first name and only date and month (not year) of the date of birth.
Does IRCC or any other countries immigration authority have restrictions for those who have this kind of affidavit?
You may also want to include a good letter of explanation to clarify everything.
All the best