Here's a timeline

...of 1st century sources that refer to, either implicitly or explicitly, the Virgin Birth of Jesus Christ:

1.  Galatians 4:4- Written circa 50 AD*; while this is an implicit reference, the Greek grammar appears to hint at Christ's virginal conception (see #6 of this scholarly article)

2.   Mark 6:3- Written circa 65-70 AD; implicit reference (see above article)

3.  Matthew 1- Written circa 80-85 AD; explicit reference

4.  Luke 1- Written circa 80-85 AD; explicit reference

5.  Christian Sibyllines, Book VIII- extra-biblical source; written as early as 80 AD; explicit reference

6. John 8:41- Written circa 90-95 AD; implicit reference (see above article)

7.  Odes of Solomon, Book 19- extra-biblical source; written as early as 100 AD; explicit reference


* I have tried to use dates accepted by the 'scholarly consensus'