Philanthropist Roslyn Packer, mother of billionaire entrepreneur James Packer, entered Thailand's ultra exclusive Chiva-Som wellness spa in earlier this month. As reported by The Sydney Morning Herald on Saturday, Roslyn, 80, booked in for a week at the luxury wellness retreat. The facility costs $2000 to $6000 a night and has been frequented by Kate Moss, 45, and Madonna, 60. Roslyn Packer (pictured), 80, entered a $6000-a-night luxury wellness retreat in Thailand favoured by Kate Moss and Madonna earlier this month... It comes less than a year after her son James entered rehab for mental health issues Roslyn, however, appeared to be in good health, according to one British socialite who told the publication: 'She looked absolutely amazing. I couldn't believe she's 80 years old, she had the energy of someone half her age.' Indeed, age does appear to be slowing down the matriarch, with the philanthropist celebrating her 80th birthday in style in November last year. The widow of media mogul Kerry Packer was joined by around 200 guests at the Chiswick restaurant in Woollahra, Sydney. Paradise! Philanthropist Roslyn, mother of billionaire entrepreneur James, entered Thailand's ultra exclusive Chiva-Som wellness spa in earlier this month. As reported by The Sydney Morning Herald on Saturday, Roslyn, 80, booked in for a week at the luxury wellness retreat Tranquility: The facility costs $2000 to $6000 a night and has been frequented by Kate Moss, 45, and Madonna, 60 She appeared in lively spirits while mingling with friends and family, including her former daughter-in-law Erica and TV personality Lisa Wilkinson. Notably absent was her son James, whose recent personal problems have no doubt caused Roslyn a great deal of stress in the past 12 months. Roslyn and Erica seemed to be getting along famously, with the former model still clearly enjoying a close relationship with the Packers. Roslyn, however, appeared to be in good health, according to one British socialite who told the publication: 'She looked absolutely amazing. I couldn't believe she's 80 years old, she had the energy of someone half her age.' Pictured: Chiva-Som Strength to strength! Indeed, age does appear to be slowing down the matriarch, with the philanthropist (pictured) celebrating her 80th birthday in style in November last year. She and James - who share three children, Indigo, Emmanuelle and Jackson - separated in 2013 after six years of marriage but remain friends. It would appear that Roslyn still views Erica like a daughter, as the two women were seen smiling and laughing together on the lawn. Meanwhile, the lady of the hour wore a chic white sleeveless dress for the occasion, which she accessorised with a butterfly brooch. Roslyn completed her look with a pearl necklace, statement earrings and a pair of oversized sunglasses. Family fun: The widow of media mogul Kerry Packer was joined by around 200 guests at the Chiswick restaurant in Woollahra, Sydney. Pictured from left: Roslyn, James, Erica Packer and Gretel Packer (back right)All rights reserved for this news site dailymail and under his responsibility