well...i'm also 37 and realize that listening to my body is key, that said i feel better/younger than i did @ 27, the difference between us is - i've been training 4-7 days a week for 6 yrs now only taking a week off perhaps once or twice in that amount of time.
i was a skinny bastard, now i'm not, i could be bigger and leaner, i'm 12-14%bf @215lbs.
bla,bla,bla me me me...
i understand that your frequency is increased w/ FBW but once exercise, 3 sets, per bodypart ain't going to get it done i don't think. seated smith machine behind the neck presses???? come on.
barbell and/or db rows for back, pullups and/or heavy pull downs, rack pulls if not deads at least. you need more meat and potato movements, train your legs, whether or not you think you can, your legs will/can adapt and take the beating. at least 2+ exercises per body part, from the sound of it all you are not bringing Dorian like weight or intensity so your only hope is a bump in volume.
28% bf is pretty fat as you know so the increase in volume will help metabolically. it seems your calorie #'s are low, many folks drop way too quick and their metabolism shits the bed, or they lose weight but it's equal parts fat and muscle, your aim is to keep muscle right?
sorry if i come off like a jerk, it's late, i'm high on NyQuil. i don't post in here too much because it can be frustrating. i sincerely hope you reach your goals, 1500 cals is seemingly low, where were you at before (answer internally because i'm not able to, time wise, keep this an open dialog, i'm busy writing dumb shit in GAL and SAMA)?
age isn't a good excuse, neither is time constraints. you didn't make any excuses so sorry for the pre-judge.
your cals seem low, hope you are cycling at least, and that doesn't mean 3-5 no carb, it means 3-5 low carb centered around bf and pwo carbs. get more quantity of exercises...that is all.