Caitlyn Jenner is blowing people’s minds this October as fans can barely believe how old she is. Many can’t keep their opinions to themselves and take to a Reddit thread to share how they think she “looks great” for someone “pushing 80.” While Caitlyn Jenner has many positive words being fired her way, some critics are picking apart a birthday tribute Kim Kardashian posted on her 75th birthday. As some people slam Kim for being “cold,” others comment their thoughts on the SKIMS founder simply keeping up “public perception” with her post. Fans can’t believe Caitlyn’s youthful lookOctober 28 saw…