I'd appreciate any thoughts on how training for Whitney should change as you get older.

I'm early 60's now. For decades it's been clear to me that with the same amount of effort, my results decrease. So for running, with what used to be the effort I exerted to run an 8 minute mile pace now gets me a 12 minute mile pace. And with what feels like the same amount of effort, my Whitney times keep getting longer.

I understand the inevitability of declining performance as you age, but wonder how my training should adapt to deal with this. Less aerobics and more strength training? Some high intensity workouts each week?