At the recent AANA meeting, membership data showed a number of CRNAs in the over 65 group. Anesthesia is a profession, not a job, so people tend to take it seriously and stay in it as long as they safely can. I personally know about five CRNAs who are over 70 and who happily do anesthesia every day.
My wife and I plan to retire from the profession at age 59... about 4 more years. Fortunately this job pays well enough you can put away serious money to retire on. We actually will not be looking at a decrease in income once we retire.