Strength and endurance for older guys

I've been working out for about 6 months now. I'm 55, and want to improve my strength and endurance to help stave off old age as long as I can. At my work, we started with a trainer, but he is no longer with us, so I'm looking for direction. Here's what I'm doing, and some numbers:
Warm-up: I run a flight of 22 stairs. I'm up to 30 flights up and down, or 660 steps. I run maybe 8 sets, then stretch or hit a few yoga poses to get my heart rate under control. My heart rate is hitting about 140, and takes about a minute to get back under 100.

Weights: I mix it up, doing different things each day. I work out 3 days a week, an hour a day.
Lat pull-down: I can do 20 @ 170 lbs., which is the max on the machine.
Leg extensions: 20 @ 125
Leg press: 20 @225
Dumbell press (on a stability ball) 50 lbs each hand: 15-20 reps.
Chin-ups: I can do 15 now without stopping
I also do crunches with the pull-down machine, 75 lbs and 20 reps.
Pec deck- 100 lbs, 20 reps.
There are other things I mix in, such as stretching and yoga, and I do a little kick boxing. I can kick for two minutes straight, getting in 60 kicks per leg. That really drives the heart rate up, hitting 160.
Obviously, I don't do all of these every day; I make up a circuit, and hit each exercise 3 times.
So far, I've lost 20 lbs and 6" off my waist. I'm 5'10', 203.
My question is: Should I be doing heavier weights, or lighter weights, and more reps? Is cranking the heart rate up and down good, or should I go for a longer, but more reasonable rate? All of my other stats are good: B/P 120 over 80, cholesterol 185, resting pulse mid 50's, and no medications of any kind. My only problem is chronic plantar fasciitis, which precludes running and walking (thus the stairs). I also hit my Concept II erg a couple times a week at home. How does all of this sound? Any suggestions? Thanks!

Jay
 
On your 3 weight days.. are you doing one set of each exercise in a circuit style? Just at a glance that seems like a lot of reps for strength endurance.
 
I do a total of three sets of each exercise, for a total of 60 reps for each particular exercise. Actually, the trainer only had us doing one set, and once we got to 25 reps or so, we'd add on a little more weight. I've amped it up a lot since he left, because the weights weren't challenging. With 90 lbs on the lat pull-down, I'd get bored before I got tired! Due to my age, I'm a little concerned about going really heavy on the weights. I can't afford to blow out a knee just to get buff. I'll be doing a lot of physical work in the coming years, as I'll be building a house, and then developing my rural acreage, so I want to be as fit as I can be for the coming challenges. I know next to nothing about any of this, which is why I have so many questions.

Jay
 
You know, maybe it's time to change it up (and granted I am not familiar with any imbalances that you might have) but what do you think about something like a FULL BODY workout 3 times a week (3-4 sets of 8-12) or a split routine:

(3-4 sets, 8-12 reps)
Day 1- Chest, shoulders, tri's
Day 2- Legs
Day 3- Back, bi's

I just don't see the point of doing 20 reps if you're increasing the weight. What are your thoughts on this?
 
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