A good way of being paid to share your passion for all things arb with others is to become an assessor or a teacher. If you've been in the arb world for long enough to have guided junior colleagues, you should have a good idea of whether you'd enjoy it or not. Teaching isn't for everyone but if you do enjoy inspiring and helping people it you'll find it rewarding and you'll be able to continue to work in and around trees for many more years.
If being an assessor interests you, you can find more out about it through Lantra and NPTC who both offer assessor training, follow the links below:
NPTC Assessor Approval Process
Lantra Become an Instructor or Assessor
If you're thinking of taking up vocational teaching and want to be based in an educational establishment, you can start leaning about the process here.
If you're thinking of a more academic route, such as a college lecturer, you'll likely already have contacts in the academic sector who will be able to advise.