If I was going to be traveling and mingling with crowds, I'd likely get the booster. But everybody I mix with has had the vaccine and boosters or had the virus. So they should be immune at least for a while. My sons got the vaccine and one booster to protect me, they say. So I might not need to.
Entirely up to you, but there are millions of seniors that won't. As for me, one year I didn't get the flu (Senior High Dose) shot and got the flu that turned into a spot of pneumonia on my one lung. I truly felt like I was going to die from coughing. When we got our last booster, there were plenty of young and old getting it. But, as said, "entirely up to you".