When my clients said they were retiring early, I always asked them why? So often it was due to health.
So we would file for retirement and disability at the same time. My experience was that in years past, the disability was always approved and the person received the full age 65 benefit early and early Medicare. (after 2 yrs on disability)
Recently however the SS administration has been rejecting these cases for disability and the client had to fight the SS Adm. Every case was won by my clients, but they had to jump through the hoops.