The way that the man is looking into the camera, suggests that he is trying to show that the anti-antiperspirant itself attracts younger people.
It looks like the some of the cartoon figures are being mischievous, for example on the mans ear there is a cartoon figure who has caught a shark, and there's another figure who is hanging from the sail on the boat. This is a good way to attract a younger audience, as younger people are usually mischievous. The poster uses tropical things such as palm trees, and tropical colours such as clear blue.