Richardson (under RANDOLPH) has no dates for Clement, so there probably aren't any.
Clement's father George was born about 1493 (24 in 1517) and Clement's granddaughter was baptized 1589. That makes a 96-year span to divide into 3, which is very comfortable with plenty of slack. It would lead to about 1525 and 1557 as a first guess for the generations in between.
George had 3 wives, and 7+2 kids by his 1st wife, and more later, so they didn't hang about. Clement was 3rd son, so maybe earlier rather than later, more like 1520.
Clement's sister Jane (under CORBIN) married (2nd) in 1546 and had 8 kids before her husband died in 1559. That also suggests she was born around 1520. We don't know whether Jane or Clement was born first.
Not suggesting that we can infer any facts here. It's just estimating for the sake of estimating.
Jane and her 2 sisters Joan seem to be a duplicates.