Don't get too excited about naturally longer lashes... Mine have always been relatively long and thick (they easily touch my glasses) but when I was taking prescription eye medication for about 7 years, one side effect was longer thicker lashes...
It was such a pain. I was pulling 3-5 lashes at a time per eye several times a day just to keep them from falling out and stabbing me in the eye.
I have a feeling cosmetically modified lashes are much easier to deal with.
I don't know what effects estrogen has on lashes, but I at least hope it is very minimal.