Stronglifts questions

At the age of 49 5x5 tends to become too much volume fairly quickly for squats. My first recommendations would be to lower to 3x5 and continue with your 2.5kg linear progression like normal so the fact that the app did that is probably for the same reason. I'm guessing since I'm not famIliar with the app

For your overhead press 40kgx5x5 is decent but you're working with smaller muscle groups so it's harder to keep adding 2.5kg every time. First recommendation there is to keep going but only add 1kg or even as low as .5kg each workout for the press. You can do this for bench as well when it gets to hard. You can also lower the volume to 3x5 as well since it's more than enough volume to keep the linear progression going.

Good luck
P.S. we all start out week. Getting strong is hard. If it was easy everyone would do it.

i can't possibly prescribe an exact overhead-press weight for you, but i thought i'd add this remark:

i don't find that the overhead press is worth doing unless it's with weight manageable enough for me to do it well. it's just not a lift where you get very much return back for straying outside the form tolerance. and it's a bit of a feedback loop too. i've never wrecked a shoulder muscle by ego-ing press, but what i do find is that the form itself is very much a matter of being able to 'feel' the muscles. and as soon as you have one little deltoid or teres or something that's tweaked, that gets messed up so you can't do it well the next time around either, unless you heal fast.

grains of salt: i'm a woman, so #upperbodylifts; i'm 52; and i already had a bit of a wonk in one shoulder before i even touched a barbell. so maybe i'm just a bit of a special case, but that's my experience. against those things i'm slightly proud of my [relative] ohp strength, and i really think that most of that comes from patience and precision instead of sheer grit.

I agree with Klrenn and canadianlbs' comments. Stronglifts and other beginner strength programs work on the principle of progressive overload, which means keep proper form and keep adding weight. If you're eating/hydrating properly and resting enough AND are still unable to progress then it's probably time to switch to a 3x5 program.

A good way to think about your weights is relative to your body weight. What are your lifts as a % of your body weight?

To give some perspective, Stronglifts was my first every weight training program and I switched to 3x5 at around a 1.5x bodyweight squat, 1x bw bench, 1x bw row and 0.65x bw overhead press. I'm not genetically gifted and I know people who go much further before switching.

P.S. age is just a number. I'm confident you can smash through your current numbers, good luck!

I am pushing 105 lbs on the shoulder press... to get over that hump I have begun working supplementary exercises like bicep curls and tricep extensions and a few deltoid exercises... I have also decreased weight and increased reps to overcome these plateaus... progress will be non linear...at 52 my deads are hitting 230 lbs... bench 135... squats 220... shoulder 105... rows 105... goals are: deads 305; bench 225; squat 275; shoulder 185; row; 185... are they achieveable? I will find out in about 2 years... building muscle and strength takes a long time... be patient lift regularly, and don't be averse to doing additional lifts to target weak points to address those plateaus