Some good advice I got several years ago.
As you get older more of your workout needs to focus on warming up and colling down. At 20 a 60 minute workout would be 5 minute warm up, 50 minutes workout, 5 minute cool down.
Add 5 minutes to warm up and cool down at 30.
Add 5 minutes at 40.
Add 5 minutes at 50.
So now my 1 hour work out is a 20 minute warm up, 20 minutes of work out, 20 minutes of cool down.
At 50 I also added a mobility routine that I do every morning. I can and will skip workouts, but if I skip the mobility work I am going to have a day filled with little bursts of "what the hell was that" from my hips, knees and back.