Hi Johnny...... We have similar pasts.... My hey day was between 91-95, then picked up injury and lost interest and didn't run again untill my 50th birthday seven months ago..... Of which due to injuries I've managed about three months training broken down to a week here and there.......
The problem's I am finding at the moment is first memory of what I used to do, and I end up sometimes pushing myself to hard for the body (hence injuries)........ And second is weight (why I started running again), back in the ninties my running weight was 11-9 stone, seven months ago it was 15-8 and today its 15-8, can't shift a ounce.......
Was hoping to have done about a dozen races so far this year, but only managed two, 5k in 21.30 and 10k in 45.22.... Aims at mo are sub 20 for 5k and sub 40 for 10k, but its going to take some work, plus I need to shift 1-5 stone......
Good luck with your running......