Same age as you OP but started running a few years ago, since then it’s become a bit of a routine digging the trainers out in October each year, running a couple of evenings a week until the clocks forward.
Trouble with this routine is each year is like starting all over again.
First couple of runs will be 1 to 2 miles jog or walk don’t try too hard you don’t want to put yourself off. The legs will be in agony for a few days after each run and the first year I had shin splints, marching foot all sorts of ailments just take it easy, they all get better.
After a month or so I’m doing 5ks it takes about 30 minutes and good chance to listen to music,clear the mind etc.
Agree with the comment earlier ‘re Junk miles, couple of years back I was running 10 miles + but it was just plodding not doing anything.
I was adviced to do intervals on short runs and a few minutes with dumbells afterwards to improve fitness, which I think is good advice although sometimes running is like riding your bike, it’s just nice to get out and enjoy it.
Keep going at it.