Are you single and 35+ ? Have you still considered having a baby ?

I am 36 yrs old and I do still want a child.  What is the age you should consider not having a child ?  I wonder will I ever have a child, this is a major question I have in my mind.  Do I do it by myself ?  Do I want to be a single parent ?  Will I meet Mr. Right/Just Mr. in the timeframe that I still will be able to reproduce ?  Just thoughts in my mind.