Health and financials aside, it's something I'd love to do so I say go for it.
However, off season, how will you get through it? A site my fiancee and I regularly stay at is open to tenters year round but caravanners/motorhomers are banned during the colder, wetter months so there's less chance of them getting stuck.
Their main income is from farming so the tractor is handy for pulling out eejits who sink their glass fibre palaces.
It's a 7 day a week 52 week a year job from dawn to dusk with F all chance of getting away for the owners, but they don't mind as they love it.
Older age. Will you be able to cope when the wrinkles are more pronounced and what happens if/when you can't?