It sounds to me like you are looking for the much-maligned 'clean bulk'.
Speaking purely from experience, it can be done, but conditions typically have to be optimal for it to work; at least in a satisfactory time frame.
By this I mean your age will make it tough - very tough. But still do-able. And don't expect it to happen quickly.
2. More protein!
4. Work harder.
...and you may have to address total calories too, but I'm far from an expert when it comes to caloric intake and bodyweight/composition etc.
But it can be done mate.
W.A. AMATEUR STRONGMAN
Axle clean-press: 100 kgs (220 lbs)
Bench press: 135 kgs (298 lbs) - 1st PL meet 16th October 2011
Deadlift w/Barbell: 180 kgs (397 lbs)
Deadlift w/Hexbar: 225 kgs (496 lbs)
Farmers walk: 240 kgs (530 lbs), 50 feet
Front squat: 100 kgs (220 lbs)
Log clean-press: 100 kgs (220 lbs)
Strict OHP: 85 kgs (187 lbs) 3 reps
Tyre flip: 260 kgs (573 lbs), 100 feet