Late 30s to early 40s - any difference?

I'm 49, diabetic and going strong, yep I pick up a few injuries but I did when I was 39!  I think a good diet and sensible training help, at 39 I was still liable to rush headlong into things now i'm more likely to think about it, oh god I'm growing up!

At 40  (traing properly since 23)  I have found I make better gains now with the odd rest day thrown in..A big impact has been deadlifting for the first time !  Been Dl for 8 weeks now, solid strength gains and muscle im provements.  Overall since late 30's I have not noticed too much dif...happily a little more vascular...  As i can afford more protein (food and powders)  I think that has helped ..The down side is more work stress and more resposibilities...

james i know excalty what you mean , last 3yrs i have had to think more about stayin healthy and injury free more than all out mass attack lol, designing my program differently , ie  more cv , less grub, and supps that help with health and wellbeing , and running coures differently too , but am getting good results .. now just got to get conditioning right   

Far far harder to gain(natruly anyway)
Injuries are more frequant and last a lot longer(i train with this in mind now so it doesnt happen)
health is great and imo can only improve with training.
Body fat is harder to shift, shiftable yes but harder.
 
 

I'm 45 now. I've noticed since I started training 2 months ago I seem to be feeling weary with low energy a lot more. I do have 2 jobs with the fire service turning me out all over the day. I feel a lot better about myself though and a damn sight fitter. I'm eating better. Maybe I better look into diet/ suppliments a bit better. Above all I really enjoy pushing myself on the weights.

I can relate to a lot of stuff you guys are saying.
at 40 my strength is nothing like what it was mid 30's.
I have started doing more reps and less weight now to compensate for lack of strength.
Also at this age its the wear and tear of lifting heavy when younger that finaly catches up with you.
my physique is really good compared to most younger guys at the gym but they are lifting more.
age is bollox and i will never give up fighting it . NEVER!!!!

James, cannot comment training wise as I wasnt traning in my 30's,  but I do find the fat is coming a lot quicker and taking far more to shift. The other noticeable difference is that I seem to tire far more easily, which for me is more of a pain :(