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As someone who played virtually all of my tournament under the old scoring system, but has watched a fair amount of badminton under the new...
Wait till he gets to be about 59 (my age) and will probably find that drops are the only shot he can hit and that you can beat him quite easily.
Unless the methods for repairing torn achilles tendons have advanced greatly since I tore my left one twice (1983, 1993) playing badminton, it's...