I think what you might be able to achieve in most cases depends on your individual make up and response to exercise.
At age 43 I got to around 110kg at sub 15% bodyfat, at a height of 190cm. But this took literally YEARS of training - starting around age 13 in school, in the 1980s, with slow and sometimes backwards progress over the intervening years. No PEDs or TRT etc - just a long time trying (and often failing) to string together many months of consecutive steady progress.
I focused on different types of training at different points in time; dabbling in MED stuff based on Stuart McRobert’s work that I discovered in the early 1990s when I started university, I moved to the Yates / Mentzer high intensity approach a few years later and then moved away from that towards a more moderated approach, basically a modified powerlifting approach to periodisation (micro and macro time cycles) but not using powerlifting exercises.
Focused on the big compound exercises and prioritised legs and back training over the smaller muscle groups. Deadlifts / squats / pull ups / rows / shoulder press and some bench (less and less as time went on - albeit see cautionary tale below!) 
Always kept some small amount of low intensity cardio in parallel (e.g a couple of slow 5k treadmill runs a week etc) and played rugby up to age 23 and again from age 30 to 31 and then badminton once or twice a week for most of my late 30s / into my 40s.
It’s definitely not too late at your age to see improvements in strength, flexibility, muscle size etc. you don’t need TRT (all else being equal) but do need time and steady consistency over that time.
For me (I know another may disagree) I found getting sufficient protein was a game changer in terms of seeing improved muscle growth from my training, but hard to tell if it was that alone, as I equally improved my sleep and other things over time as well. I’d advocate prioritising recovery as much as the training to get a good balance.
A cautionary tale though - the high intensity training I did in my younger years came back to bite me - I had a detached peck tendon (it didn’t snap as I wasn’t using a heavy weight) in Jan 2016. The surgeon claimed I was very lucky, as he’d done many similar surgeries over the years and they were almost always snapped from too heavy weight being used. In my case the tendon end had literally peeled off the arm bone and his estimation was it had been slowly doing so for a number of years based on what he saw.
I’ve not been in a gym since that day.
Long story short - got depressed (I’d lost my lifelong pastime), lost a ton of muscle but put on a TON of fat in about 9 months - ballooned to 269lbs.
Then I rediscovered cycling as a consequence of good friends pushing me to address my health decline. Now at circa 89kg / 197lbs and a lot better for it 
Good luck 