Borthwick has scored around 400 goals and played for 11 non-league clubs.
After a recent game, a 5-1 win, Borthwick, a retired engineer, said, "I felt absolutely fine afterwards, the knees were all right. I enjoyed the game and sprayed quite a few passes about. I even went on a run down the left wing and put a good cross in, which reminded me of my glory days.
"It was quite an even first half, but I think they began to tire a bit in the second half!"
Explaining his resilience, Borthwick said, "I have got a good strong body which I got from my mother, who was a big country girl."