I believe the "dance till you fall, love till you die" are examples of just doing it and the "shut your mouth, raise the roof" lyrics are getting a kiss from a girl. Raise the roof because the kiss will make you high. The guy's been through multiple relationships, he's getting older, and his spirit is sagging. He's singing about the time when he can unlock his heart again. That's my take.
I believe the "dance till you fall, love till you die" are examples of just doing it and the "shut your mouth, raise the roof" lyrics are getting a kiss from a girl. Raise the roof because the kiss will make you high. The guy's been through multiple relationships, he's getting older, and his spirit is sagging. He's singing about the time when he can unlock his heart again. That's my take.