"We've reached 90 old man!!! I start this day paraphrasing you 'We're feeling bad but doing well.' Today is your birthday, but God gave me the gift of having you on this day. I love you with my soul. Stay strong dad," Menem's daughter Zulema wrote on Twitter.
Since entering the Senate in 2005, Menem has kept a much lower profile than during his presidency when he pursued an aggressive privatisation policy.