Yes! And there are many stories of women in their 40s who successfully conceived using kegg. Kegg is recommended for women in their reproductive years, 21 years or older, who ovulate and have cycles. kegg helps women identify their fertile window in order to optimally time their trying to conceive efforts.  Many women in their 40s report that by using kegg they feel more confident they are maximizing their chances of conception as they are not missing valuable days of the fertile window, when compared to using other fertility tracking methods, such as detecting the LH surge or recording their basal body temperature. Every egg counts and with kegg, you can be sure you are timing your efforts accurately.