I'm not the OP, but I started on Stronglifts and now run 5/3/1. Current 1RM lifts are around squat 155kg, bench 122.5kg, deadlift 220kg.
I'm 35, I've been lifting for about 2.5 years. Most of my progress was linearish for the first 1.5 years or so, and has tapered off. 5/3/1 is a periodized program so the gains come more slowly (as they must once you exhaust linear gains), but they're still coming.
I started at 310lb and ~45% bodyfat and at my lightest got down to 230lb/~18% bodyfat. I'm currently about 260 and around 24% bodyfat (via DEXA; calipers underestimated my BF% by around 10%!). I'm 6'10", for reference.
I've had a few bouts of tendonitis in my wrists, mostly due to incorrect benching technique. I had some really bad knee pain around the 100kg squat mark, so I went to go see a sports medicine doctor who referred me to a sports physical therapist, who taught me how to squat using my hips rather than my quads. I'm now moving quiet a lot more weight with no knee pain, which is a remarkable achievement given that I had chronic knee issues for most of my adult life - bad enough to necessitate surgery.
I love what lifting has done for me, and think everyone should do it.