The key is pride. The pride you feel when you look at your field. IMO one of the most beautiful things on earth is a well manicured baseball field. And I have no doubt that it is part of building a successful program. It's all about how much someone cares.
That said, 70 years old might limit what some of us can do. I would ask if there is enough in the budget to hire an assistant or two with a strong back.