Merkel, a trained physical chemist, reaches the milestone in July when her Christian Democrats plan to throw an event at party headquarters for around 500 people, according to Der Spiegel news magazine.
Like for her 50th in 2004 when to general surprise a brain researcher spoke at a similar event for Merkel, then still just party leader, a scientific lecture is again in the works, it said.
"It's said that Merkel has not yet decided which professor will speak," Spiegel said, adding that invitations were due to be sent out after this week's European elections.