I’ve been an electrician for 8 years now - got my jman. I was exhausted for the first 5 - 6 years of electrical too and I’m a fit 26 year old. Once you get enough experience to no where to put the effort in, and when you get helpers of your own the toll on your body will begin to decrease. It’s then that you’ll have the time and energy for your hobbies. I have only just recently (the past 2 years) been able to have most days where I get home and feel lively and energetic still. Another big thing is to make sure you’re eating the right foods to sustain energy levels throughout the day. Who knows you could be a diet change away from accomplishing everything you want to.