I still do casual work as a park ranger.
the only qualifiaction they really wanted was a first aid certificate (which I don't have but I suppose being a nurse helps)

the other was enthusiam & an interest in the area, some of the others have their degrees but it wasn't a necessity.

re being too old we have rangers from early 20's to late 60's.

its a lovely job - good luck getting into it

as others have said see what other work you can do - we have bird & animal surveys which volunteers can help with - its a good foot in the door & experience for further applications

slainte

alison