Anna Sale guest hosts for Leonard Lopate. On today’s show: Tanya Selvaratnam weighs the pros and cons of delaying having kids. Jane Pauley talks about her career and the opportunities that lie ahead once we turn 50. Nicole Polizzi—you may know her better as “Snooki” from MTV’s “Jersey Shore” —talks about how having a baby has changed her life. And Scott Stossel chronicles his own anxiety and the anxious through the ages.