Creating new pollards

[Stere]

How old/young does the tree ideally need to be if I want to make a new  pollard?

 

 

If tree is two old won't lopping larger branches off it create rot, suppose its species dependent also.

 

Iv'e seen acient unmanaged pollards (though rare locally) in countryside & street tree pollards, but zero younger ones so was thinking of trying to create a few new ones  along a field boundary as supposedly they increase the lifespan of trees & I  think it would be interesting etc.

 

Just being reading Roger Deakin Wildwood had abit about pollarding used to be a common method for firewood & animal forage. Rember seeing telly program about the tradition in it in spain they were still  climibinng up & using axes for pollarding...