I agree that time with family, and time to do things is more important than working your life away. We only live once. I decided about 10 years ago not to take any job that will require that I work over 50 hours a week (40 + 10 hrs overtime is plenty of working to be doing in a week). Then a few years ago, maybe 2017 I decided that I will never work 7 days straight in a row. At least 1 day off in a week is a bare minimum requirement to keep your sanity. The most I have done since then is 6 days straight.
As far as being 70+ years old and deejaying events...My Dad does this, but I do not wish this on anyone. I personally think my Dad should not be deejaying any more...Maybe if he did not have to do any physical lifting loading in/loading out, and he just showed up to a place that had everything ready to go. All he would have to do is turn the equipment on, and start his night. Turn the equipment off when the night is over, and walk to his car to go home. That would be fine, but not how he currently works for him.
Also, my wife said I am not allowed to be deejaying after the age of 60. She has told me that come age 60 she will force me to sell or put my gear away, and I have to find something else to do. She hates that my Dad deejays at his age, and does not believe that any one who is a senior citizen should be deejaying any longer at that age.
She came to this conclusion after she helped me out on a gig ONE TIME, and could not believe how much physical work I do at every event. She says she does not know how I do it, and there is no way I am going to be out deejaying in my 60s, and certainly not in me 70s...LOL.
Of course, who knows what the future holds. Deejaying as we know it may not exist, or be very different in 22 years
So I guess my wife has limited me to another 22 years max in this profession!