But John Mayer will leave me Jennifer Aniston as you probably know is dating John Mayer.. He is 30 and she is 39 and she is apparently scared that he might leave her for a younger woman (he would be so stupid if he did) so she is spending insane amounts of money on herself to look her best.  Her body is in perfect shape but still she spends $1,000 bucks a month on anti-cellulite spa sculpting treatments even though she has no cellulite.   She also spends 2,000 dollars a month on a persona...