Designer Marc Jacobs is dunzo with his relationship with Jason Preston, his 25 year old boy toy. And guess the cause of the breakup: Yes indeed it was the age difference. Jacobs is 43 years old and confesses that "It's just not working. I have to be in bed at 11.30pm and he wants to go to clubs every night." Didn't Dolce and Gabbana break up last year. Maybe Marc could date Dolce or Gabbana.