Rip, you're an old guy*, I have a question.
You're about my Dad's age and whereas you made lifting weights your hobby (and ultimately your career), Dad got really good at tennis and still plays 3 nights per week.
My question is, what effect do you think heavy weight training over decades has had on your body (besides simply making you stronger)? You and he have obviously pursued different fitness-related endeavors - yours the more taxing physically. My Dad has what he calls "old guy" aches and pains - creaky knees and shoulders, arthritis-style achy hands...stuff like that. It's not because of tennis but it affects his tennis.
Do you have these? If so, are they better or worse than they might have been had you not gotten strong?
*No disrespect intended; quite the opposite.