[BostonCard]

If a rule preventing a biological male from competing against a biological female in a certain sport is "arbitrary," then why would not a rule preventing an 18 year old from competing against an 8 year old also be arbitrary?

Yes, of course age cut-offs are arbitrary (if reasonable).  Why does an 8 year-old born on Jan 1, 2013 get to compete in U9, while an 8-year old born on Dec. 31, 2012 have to compete in U10?  It's because you have to set a threshold somewhere and a calendar year was a convenient place to do it.  But it is unquestionably an arbitrary threshold.

BC

[BostonCard]

If a rule preventing a biological male from competing against a biological female in a certain sport is "arbitrary," then why would not a rule preventing an 18 year old from competing against an 8 year old also be arbitrary?

Yes, of course age cut-offs are arbitrary (if reasonable).  Why does an 8 year-old born on Jan 1, 2013 get to compete in U9, while an 8-year old born on Dec. 31, 2012 have to compete in U10?  It's because you have to set a threshold somewhere and a calendar year was a convenient place to do it.  But it is unquestionably an arbitrary threshold.

BC