Hey e36Adz, glad to hear you're getting back into it mate and you're definitely not old, one of my mates is 44 with a build that puts me to shame and he started training at 36 yrs old.
Don't worry about putting a bit of fat on in the beginning due to consuming more calories, cutting fat can come later
If you're really looking to pack on size, I would recommend a 4 day split if you could stretch to that. The routine I posted in my post above is a perfect starting point, it's what I started on and stayed with it for about 2 years and saw great gains.
In your training routine I could not train shoulders effectively the day after chest/triceps as my triceps get used a lot in shoulders and would probably be knackered from the day before. Also no way in hell I could train legs and back in the same day if I was training them as hard as they should be.
If you absolutely have to train 3 times per week I would recommend a routine called PULL/PUSH/LEGS. Something like this ..
Pull - Day 1
Deadlift
Barbell Row
Pullups
Barbell Curls
Push - Day 2
Incline Dumbbell press
Military Press
Tricep Dips
Skullcrushers
Legs - Day 3
Squats
Stiff Legged Deadlift
Leg Extensions
Standing Calf Raise
Abs
You could try that routine, note that you should have 1 day rest in between each session, so day 1 could be Monday, Day 2 Wednesday and Day 3 Friday for example. It might not look like a lot but if you're hitting it hard, eating well and getting plenty of rest, you will gain no doubt. It's a tried and tested routine that a lot of people have gained off, there are probably a lot of guys on this forum who have used something similair.
As far as rep range/sets goes, an example, my arm session on Tuesday. I began with close grip bench press for triceps and the reps/sets were as follows.
Olympic bar 20kg warmup 20 reps
60kg x 12
80kg x 8-10
90kg x 8-10
100kg x 8
I've always liked to pyramid up my sets, like work up to a heavy lift. What you're doing are like drop sets. You could try up the weight like I do, but don't increase in 5kg increments, try 1 warm up set and 2-3 working sets of 6-8 reps to failure, which is enough to break down those muscle fibres.
Also get your diet sorted aswell if you haven't already. You grow in the kitchen not in the gym, remember that. Eat loads of chicken, pasta, tuna, oats, rice, eggs, fruit, veg and some fish like mackeral. Aim for about 1.5g of protein per lb of bodyweight.
Hope that helps in some way mate, any more questions just ask