The "Friends" star, 50, was on vacation in Cabo San Lucas, celebrating her best friend and former co-star Courteney Cox's 55th birthday and. The 53-year-old actress showed off her killer bikini body via Instagram, captioning a series of snaps, β€œTake us back πŸ™πŸΌ,” on Monday, August 15. Aniston glowed in all of the photos, most of.