'll punch you up a little bit if you want Cain...nothing serious...couple lost lost teeth,broken nose, and a couple black eyes won't be that bad...I promise not break any joints...
If body weight is used as a factor of age, and age is seen as a proportion instead of a climbing number, 40 can be seen as rather old for someone with enough weight.
Sparring at least would be fun, I wouldn't want to deal or receive any serious damage.
Even a shitty opponent has a chance to be lucky and break something before going down, so I figure why chance it when power could simply be demonstrated through restraint instead of force.