@BlueBug45 Here is the current guidance on the topic from the American College of Obstetricians and Gynecology as of 2014
Female Age Related Fertility Decline
which says in part:
The fecundity of women decreases during the reproductive years primarily because of continual oocyte atresia and becomes significantly compromised before the onset of perimenopausal menstrual irregularity. Based on this conclusion, the American College of Obstetricians and Gynecologists and the American Society for Reproductive Medicine make the following recommendations:
Education and enhanced awareness of the effect of age on fertility is essential in counseling the patient who desires pregnancy.
Women older than 35 years should receive expedited evaluation and treatment after 6 months of failed attempts to conceive or earlier, if clinically indicated.
In women older than 40 years, immediate evaluation and treatment are warranted.
That was based in part on this study published in 2012:
www.cdc.gov/art/ART2010/PDFs/ART_2010_Clinic_Report-Full.pdf which found
A similar trend has been observed in analyses of data derived from in vitro fertilization (IVF) embryo transfer programs in the United States. The percentage of IVF cycle starts that resulted in live births was 41.5% in women younger than 35 years, 31.9% in women aged 35–37 years, 22.1% in women aged 38–40 years, 12.4% in women aged 41–42 years, 5% in women aged 43–44 years, and 1 % for women older than 44 years
Because it's a curve you can draw the line where ever you like, but these data are not from 1700's France.
OP you are in no way too old, but do get going. I wish I had started a few years earlier but life interfered.