53 years old training to lose weight and gain muscle but

i have always trained in a gym with other people and have not really seen any gains in muscle or fat loss (mainly due to natttering more than training and it not taking much to stop) i am also a beer drinker. recently ive built a gym in my house and have really stepped up to the mark . i have not lost any weight  but loads of inches round my stomach and some noticeable gains in muscle especially since going to a mainly one body part a day(4 days a week) training over the last 4 months . people have started noticing (which i like) that my body shape is proper changing.  at first i found it invigorating and seemed to have an excess of energy but the last 2 weeks i feel tired and dont seem to be recovering from my workouts very well. (at all some days)
a typical week for me 
monday , chest  4sets x 10 flat bench press
                          4 setsx10 incline bench
                           3 sets decline bench
followed by 3x10 sets of cable incline decline and flat cable flys and 3x10 press ups to finish.
next training day 
back , 4 sets of wide grip pull ups as many as i can do 
           same narrow grip pull ups 
most days this is around 2-4 pull ups (ime 5ft6 and 92kgs) 
forward facing pulldowns 4x10
    rear facing pulldowns  4x10
4 sets of reverse press ups holding on smith machine bar and feet on bench
and finish back with bent over rowing
biceps 3x10 of dumbell curls ,hammer curls and concentration curls
next training day
shoulders and triceps
3x10 of forward lift side lift and rear lift 
4x10 dumbell press or barbell
4x10 upright rowing
and 3x10 shrugs
3x10 tricep pulldowns 
next training day legs is anything i can manage because of knee problems but mostly walking upstairs (across road from me is 119 steps long ones and i might do these twice up and down)
i finish most training sessions breathing fairly heavily and knowing ive done one
most days will finish this with a sauna 
cardio at minute is mainly walking dog
i have at least 2 and max 4 protien drinks a day and take vit supplements every day. i eat a good varied diet with plenty of fish veg fruit and quorn products(semi veggie i think they call it) and also drink plenty of fluids. 
i get plenty of rest sessions .  
i am MORE  than happy with gains made in last few months BUT its the tiredness thing thats kicked in after training and sometimes lingering into next day thats getting me down. do i need to be doing something different , alter training ,taking something different to aid recovery . CAN any of you other older chaps help please. 
sorry to have gone on but thought it better to put what i do down in full so best help can be offered

thanks steve more or less thought i was overtraining . when i first started at home i was training 6 days with one off and got for me some incredible gains and stomach fast going . i couldnt wait on a morning to get back in and do some more (i really dont know where the energy was coming from)then dropped to 5 days then 4 then 3  and then the muscle ache came in and energy dropped somedays to rock bottom. just going to do some light training next week then i am on holiday  so will get plenty of rest and hopefully come back raring to go again. i have got to say that just prior to the tiredness i was probably feeling the best ive felt for 20 years. on a lighter note does your user name come from dogs you keep. i used to have 2 beautiful bullmastiffs a bitch weighing in at 8.5 stone and a dog i bred from her weighing in at 13.5 stone and not a bit of fat on either. bitch was areal throwback to when they were bodyguard dogs for gamekeepers ,she wouldnt let anyone near me she didnt know. dog was just a big idiot who just followed whatever his mum did but on his own a real character nice natured. ive got one of those old tyme bulldogs now and shes just a good natured baffoon (to be polite to her). again thanks for answering  bryan
 

Bit late on this thread, sorry. Have a look at: http://www.cbass.com/ for articles on older people training and getting exellent results. I would suggest training twice per week on a full body routing - compound exercises for one or two sets each. As someone who is now a proper grown up you should insert some short sharp anerobic sprinting type exercises in somewhere  in order to maintain and develop your aerobic capacity.  

Also pay attanetion to diet of course. Have yo checked out the diet section in the Articles?
 
I wrote a blog post about recovery (which is where you gain muscle and loose fat) here: http://drewprice.co.uk/blog/?p=189

ive gone with a 5 day split 
mon  chest 
tue   back
wed  shoulders
thurs legs
fri     biceps and triceps
doing 3x10 one week and 5x5 week after  feel good so far
suprised myself with legs as had no knee pain during or after ime doing body weight squatting and step ups holding dumbells. plenty of good snap prot drinks and rest  . let you know if  things keep good(or bad)  
i hate full body routines  so ime trying this one that someone put me onto  thanks all for input so far , read the blog .