Im in the past 30 category and already understand this. Ive been lifting weights for about 20 years now. So, I have a great idea of what I used to feel like and how I used to recover. You are right about recovery. I hardly train with weights that dont allow me to do at least 8 reps. 3 sets of 10 are the norm for me now. Ive come full circle! I do the push, pull, legs routine. My volume is at two exercises per body part for 3 sets of 10 each. This has worked wonders for me.
Push Day: Bench Press, Low Incline Flies, shoulder press, side laterals, lying triceps extension, pushdown.
Pull Day: Chins, dumbbell rows, shrug, elbows out row, alternating dumbbell curls, concentration curls.
Leg Day: Leg press, reverse lunge (I consider this a glute/ham exercise), leg extension, leg curl, standing calf raise, donkey calf raise. I do 1 set of high rep lower back extension and mix up the ab routinesometimes swiss ball crunches, sometimes cable rope pulls etc...
Cardio: Walk 30 min. 5-7 days a week. Hard cardio for 20-60 minutes (ie. martial arts or eliptical machine) 2-4 days a week.
Diet: 3 squares a day. 2 balanced snacks. Usually 3,000 or so calories.