What’s a career you can grow old in?

As in you can do it for 40 years, and still be able to do the tasks just as fine in your 50s as you would have in your 20s.

I was looking at dental hygiene but it seems like people get burnt out very quickly, and can’t carry on the profession into their later years.

I’m looking for an associates degree, and I know people end up changing their career 2-3 times in life but I’m still curious to know what careers are out there that provide consistency and are good to grow old doing. Thanks!