By Lucy Laing It took Samantha Jones 31 years, £45,000, four miscarriages, eight rounds of IVF and a brush with death… but she finally gets to celebrate Mother’s Day with the twin girls she had at the age of 52. All good things come to those who wait, according to Sam and her husband Ian Jones, 55. They first dated for two years when they were 19 and 21 – before being reunited and falling in love all over again, 21 years later. Sam says: “Age is just a number. I have occasionally been mistaken for the twins’ grandma, but I proudly tell everyone that I’m their mum. And I will be enjoying a wa…