Ball Joints On My 73 Dart

I bought my 73 swing 11 years ago with 31,000. I do not drive it a ton but I grease the ball joints once in the summer and once in the winter. I have never heard them make a peep and the car drives better than my two other much newer cars. Mine will be getting replaced this winter when I switch to disc brakes but it is not because they are failing.

Nice car!! I will get after some grease on the ball joints! Thanks for the advice!
Mike