In the question given below, a set of four sentences P, Q, R & S is given, which when properly sequenced, form a coherent paragraph. Arrange the sentences in the correct order and mark the correct order as your answer. P. But my research kept me at more than an arm's length from the living, breathing individuals who were its subject. Q. I conducted research using longitudinal data sets and sophisticated statistical analyses. I developed and evaluated programmes to improve older people's lives. R. Ten years ago, I reached a point in my career that felt either like a dead-end or a turning point - I wasn't sure which. S. By then, I had spent 25 years as a gerontologist, professionally occupied with everything to do with ageing.