an under-40 will only have to pay once every 5 years, an over-40 only every other year
Already true for JAR class 2, and was when I went for my last medical aged 36. I was delighted to be told 'see you again in 5 years'.
I like this 'deeming' thing. At my Oxford college I remember that dogs were banned but cats were allowed (for dons) - one don got around this by asking the Governing Body to deem his dog to be a cat for the purpose of the relevant statute. They did.
Tim