I just turned 45, and I do exactly what you plan. I lift 3-4 days a week, 50-70m, depending on the program and day. ( Doing WS4SB's for last 2 months, prob several more ).
I also do HIIT twice a week, and run 3-5 miles one day a week. Works well for me,
As gay as it might sound, I do an...