I have never been concerned about getting old. After I turned 70 and had to start drawing Social Security, I figured I would end up paying most of it in income tax. I told my boss I wanted to start working 3 days a week. He was just happy that I did not want to retire. BTW, he is 87.
I work for a small business that deals mostly with Aerospace and Space. I enjoy my work and don't have plans to retire any time soon. I am about to turn 76 and love the 4-day weekend but really look forward to going back to work for 3 days.
Many people have retired in the industry I work in, and many young engineers are taking over. I can tell they are very intelligent, but their lack of experience shows. Many are trying to solve problems that were solved years ago. I have seen where they are using technology that was used in the Space Shuttle for the Artemis program and are having a hard time getting it to work properly. Fortunately, there are few people like my boss that have knowledge that goes back as far as the Appolo days and can provide advice to get them back on track.
The only problem I have with my age now is my body is slower than my brain. I don't look forward to the time when my brain also slows down. Until then, it is full speed ahead.