I'm 44. Recently I have been back in touch with some people I was at school with on Facebook - haven't seen these people for over 20 years, nearer 25 probably. I'm quite surprised at the number who are already grandparents - I saw a picture of a toddler on one of their FB pages, assumed it was their child but no, a grandchild having their third birthday. Granny is the same age as me. 
My mum was 27 when she had me and became a grandparent at 58. My inlaws were the same age. My eldest is 14 and I am not expecting to be a granny much before I'm 60, so that's my "normal". Cannot imagine being a granny by 41 and may be a bit unreasonable thinking it's nothing to aspire to?