Paige...
I thought I would share some experiences with you. I retired very early from a very large company as an Engineering Manager. ( we could retire at 52) I then started my own engineering/manufacturing company in the same field. Then retired again. When I was with the large corporation it was the company philosophy that if a person announced their retirement they would continue as is. The projects they were given were sometimes not all that desirable, but life went on. We as managers and administrators were never permitted to ask what they were going to do or anything of that nature.
However, If I had a staff member announced that they were resigning and would leave the company in three months, defining a specific date
and that they were going to a competitor. That individual would be contacted immediately by I.R. for an interview and 9 times out of 10 they would be released from the company either that day or the next day and the company would pay for the three months notice at the time of release. Many people that I know that were retiring actually did just that. Then after they were out, and no longer an employee they filled for retirement benefits saying they changed their mind. Certainly, this would not work with all companies, but our company was concerned with the loss of confidential information. My thought was that if someone was going to remove information it would be well before they announced. But it is what it is.
Additionally, those that I knew that was working after they announced their retirement, myself included, felt like a third wheel. I felt out of place, no longer included in meetings, and somewhat isolated as much as possible from the rest of the staff. I just wanted it to be over and out of there and I liked my job. The two weeks I worked after I announced was grueling. If I had to do it over again I would build two weeks vacation and announce Just before I left and fill out the retirement paperwork at the same time. If Possibly, never to return.
Best Wishes, you will enjoy retirement! Keep that as a positive thought.