Up to 115lbs 5x5 squats. Add 5 pounds 3x a week until I miss a rep. So far so good. Definitely know I will hit the wall soon.
Funny thing with SL 5x5 is you squat every workout. My legs I can already see definition coming in the quads. Squats are actually my favorite exercise but when it's 3x a week I want to kill myself.
5x5 is fine if you want to be a powerlifter, but I'd say it depends what your goal is. At our age, I'd suggest (just my thoughts) that your goal should be mobility, range of motion, preserving muscle mass, and aesthetics as we get older - not being a bag of bones.
Focusing on "strength" i.e. the numbers on your lifts is counter-productive IMO, because we are not furniture movers, it doesn't really matter what amount of weight you can move. Without steroids you're also not going to gain any significant amount of muscle after 40, so the goal shifts.
I generally only squat 135lbs x10, but I do a lot of other things on leg/core day. Here's what I do:
Back Squat - Barbell - 3 sets of 10
Deadlift - barbell - 3 sets of 10
Bulgarian split squat - 3 sets of 10
Hip Thrusters - machine - 3 sets of 10
30" Box step ups with 45 pounds weight - 3 sets of 10
30" Box jumps with 25 pounds weight - 3 sets of 10
Leg Press - machine - 3 sets of 10
Calf raises - machine - 3 sets of 20
Good mornings with 45 pounds - machine - 3 sets of 10
Suspended leg raises - unweighted - 3 sets of 10
Leg extensions - Machine - 3 sets of 10
Hamstring curls - machine - 3 sets of 10
Standing core cable twist - pulleys - 3 sets of 10
Incline sit-ups with 25 pound weighted ball - 3 sets of 10
Mason twist with 5 pound ball - 1 set of 40
Oblique v-ups - 1 set of 25 each side
I don't rest between sets really, I just walk from one set to another. That entire routine takes me and the wife about 65-70 minutes. SL 5x5 is fine and a good program for building strength but honestly strength isn't that helpful, I've gotten WAY better results training for volume and ignoring the numbers on the lifts.