Not quite a nanny but not far off, in terms of the hours we needed covering... but we actually deliberately chose a childminder in this age bracket. For many reasons grandparents weren't a great feature in DCs lives and when we met ours we just "clicked".
It was (and still is) the best decision we ever made. She filled in a gap and a role model in our DCs lives and despite DCs being well past the age of needing her, she is still an active part of their lives. She kept up with all the children in her care from 6am through to 6pm, 5 days a week from teeny babies through to teenagers.
She had been working in childcare for over 20 years when we met her, and by comparison to the other childcare providers (including nannies) we had looked at she was by far the most experienced, level headed, active and engaged. She is still working (albeit 4 days a week and not so many children) and still has a waiting list.
I am really sorry you are experiencing age discrimination @Loveshark25. I would certainly emphasise your experience, make sure your references are up to date, and keep looking. You sound great.
As an aside, plenty of the nurseries and preschools we looked at had older staff members too. So clearly not everyone looks at age as a barrier, rather focusing on the person and their abilities.