Max Pulse Change

Did my annual MP Test on Sunday. I do it on a Turbo so that I have repeatable testing conditions. All went ok but why is my MP getting higher as I age? It has risen by 2 bpm each year for the last 3 yrs. Shouldn't it drop? I'm 43 yrs and been cycling/racing for years.
remember to keep pedalling in circles.
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:?: :?: So how does he measure actual HR max :?: :?:
I know I'm getting old compared to you young whipper snappers but what the hell is MP and if you say Military Policeman I'll scream
My HRM is 200
My RHR is 50
My LAHRM is about 170-175
do I need an MP
Fail to prepare, prepare to fail
Hills are just a matter of pace
Fail to prepare, prepare to fail
Hills are just a matter of pace