DEAR ANNIE: I am an older mom of three toddlers. My husband and I tried for many years to have children and were not successful on our own, but with the help of IVF, we now have three beautiful children. Our oldest is 5 and I am now 55. I knew having children later in life would come with questions, but some people can be so hurtful. Strangers have said, “What beautiful children — are you Mom or Grandma?” What business is it of theirs, and how is me answering that question going to make their day better? In this diverse world we live in, it seems like it’s so acceptable to have two moms or tw…