Are we too old for the Sandals Resort in the Bahamas??

Question

My husband and I are thinking of visting the Sandals Resort in the Bahamas for our 20th anniversary. Needless to say, we are no longer in our 20s nor in the shape we were in our 20s. We don't want to go to a resort like this only to find that we are the oldest and perhaps the fattest ones there!! We have never been to an "all-inclusive" resort and certainly not an "adults only" one. We thought we might try it while the kids are away at camp. Any thoughts? Other suggestions?