yo homie. i'm only 36 but I've experienced many injuries that have kept me off the board for months to years at a time. After close to 8 or 10 years off, I've been back on the board for 18 or so months, with a good 5 month break in there due to ligament damage in the R ankle.
Sedentary life will ruin you. Your spine, hips, and the fascia that holds it all together while bind up. making things a lot more sore than they need to be. so MOVEMENT is key. shake things up by jumping rope or doing jumping jacks for a start.
For me the key is to build stamina- I don't generally skate every day nor do I skate for hours on end, usually just 1.5-2.5 hours of relatively low impact skating, but lots of popping around and over shit. the best way to build stamina, in my experience is to JOG. seriously, don't think about "running" or going fast or doing distance, just get a decent pair of running shoes, pick a set, flat route, and do it every other day. I do a mile, the same damn route, 5 days a week. Although I can most definitely run further and for longer times now, I still do my daily mile with a speed increase. Been doing it since last May or June and it's what's helped me get my pop back so quickly.
you don't need to go hard, but you need to go often. light calf and ankle stretches are great too, heel raises and drops before and after the job do a ton of work.
Last, you've got to flush your body. Drink hella water, man. Eat relatively clean and watch out for inflammatory foods.
@life is a hell ride is spot on about sleep too.