I’m older now too… already have arthritis. But, on TRT I can easily work out every single day. My legs are the same… 33” quads…
More calories, higher reps, more volume. Try 4 sets of 20 for squats. Squats, leg press, then hams: stiff leg deadlift (lower reps, 8-15), lying leg curl (if you can find one these days), seated leg curls, then finish with high rep leg extensions (25-30 reps), burn, burn, burn, pause at the top and squeeze.
Yes, this will be uncomfortable, but let us know if two months of that does not get you to 34"
If they have one of those chick machines that work the inner abductor (inside of your thighs), use it. Don't laugh. This machine really improves the appearance of legs on tall guys from the front, because if fills in that gap at the top that tall, thin guys get (and, no offense, but at 6'10" and 33" thighs, you are thin). Lay the seat as far back as it will go and work this in a higher range (15-20 reps) concentrating on that muscle you can feel on the inside of your thighs (if you sit up you hit this tendon thing up higher instead, not the same at all). You should see a visible difference in the mirror within a month if you are doing these right.
No, do not do this every day. Your legs should be shot for at least a couple of days.
Keep aiming for the 4 sets of 20, but keep increasing the weight as quickly as you can stand it and keep your reps up.
And get your carbs up (rice, oats, potatoes), you are a big guy and need a lot of food.