Class II age bands and medical validity

[amyt]

I'm in this situation and so it looks like I need to get a medical done. What's confusing is that I have a 'legal' bit of paper saying my medical is due in 2005. Interestingly, it says the ECG is required at AGE 40Y. Now why didn't they put AGE 32Y for the next medical exam rather than 2005? And it was issued by the CAA at Gatwick, not a 'provincial' AME so you assume they are totally on the ball.

I also have a Class 3 medical from 1999 (and a UK PPL). My understanding is that it is still a valid medical until it expires. It expires in 2004 (when I'm 33) and the info in it states that its validity period for PPLs under 40 is 5 years.
Can anyone confirm or deny this?

Thanks.