Take your time and build the intensity slowly. No need to rush, as you have the rest of your life to do this.
I too am 35- you gotta care for yourself a little bit differently than when you were 18-19 years old! Is it wise to push yourself as hard as when you were younger....? Yes, absolutely!!! But don't just jump into the
high intensity stuff without a proper "body break-in" period.....
Take some time with your form- get it PERFECT on all of your planned exercises, as that is your best defense from injury. Your
connective tissues will need a little more time to get back up to par, while your muscles will grow and develop almost immediately (as long as you have your nutrition/rest figured out).
Best thing is to stay on this board and get advice that will help you along the way- motivation is easy to come by at this place, so use it to your best advantage!
Good luck!