Of thirty bare yeares have I
twice twenty bin enraged,
& of forty bin three tymes fifteen
In durance soundlie caged,
I would say that this is based on the "Three score years and ten", and then calculations can be made from that.
70 - 30 = 40 - but this seems to be how long enraged rather than his real age
45 is his actual age - reminiscent here of the Old English kenning - woruld-cage - ribcage
So he's been alive for forty-five years but enraged(?) for forty. Maybe he means aware or even sexually aware?
Nigel
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