I am not a coach but I can relate my experience with a coach (Karl) in case it helps. I'm 62, 5'10" and started SS at 160 pounds so in the ballpark of your starting spot. Karl had me ending linear progression much earlier than I expected and not too much after that I am on a 4 day split. That spreads the work out and is not nearly as aggressive as the normal LP. I also am more likely to do 3s instead of 5s on my heavy sets. Not always, but 3s are off the table in LP. My interpretation: the older we get the sooner we exit LP and have to moderate our progression. I have also heard it said on multiple times that the elderly are volume sensitive. So perhaps keeping your intensity up but backing off the volume would help.