Wow, this is great! I wasn't aware remote internships were available at FRI.
There's significant doubt about the effectiveness of Metformin or caloric restriction among humans. NAD+ is being claimed by George Church and others to be more effective, though they might have vested interests since they produce and sell them.
Also, let's not privilege the hypothesis. If you had $60m to invest in gerontological research, would you spend it on Metformin trials?