Happy birthday & congratulations, JW!
I've been in business 17 years, still almost 30yr behind you for age. Hired an apprentice early this year. Young buck had worked for me part time for several years. He was going to be working toward an ownership stake in my company. He didn't call or show up the first day.
Since, I've used part timers to help as needed. Today young adults are like toddlers. None want to work it seems. Some of these jobs I'm offering 30$ an hour, still can't get good motivated people. Apparently 300-5000$ in a day isn't enough for some if they have to work hard for it.
I too, really love my work, and mostly thoroughly enjoy my clients. Doing rewarding work can't last forever...just like us. Keep your besties or hang it up completely. Either way it's time to truly enjoy your remaining time, family, friends, & interests. Some work till they can't, nobody wished they'd worked one more day on their last. Best wishes!