Bright green-ish is probably from uranium.
Orange could be from manganese.
Uranium was used in the 1800's and 1900's ... and then I think there was a time in the mid 1900's when it wasn't available, maybe because of war, and then it was used again in the late 1900's. And I guess it's been used this century, but I don't know.
So, no, it usually isn't a clue about the age. Except I think for sulphides (the clear glass marbles with the little white figures in them) ... I think that a faint glow could mean old for those ... and if the faint glow is missing that might mean new. Maybe someone with more sulphide experience can confirm.