I'm 36 (turning 37 in 2 months) and just finished my third month TTC. I've always gotten pregnant very easily in the past, so was very frustrated that it didn't happen right away this time, especially as I've been following the low everything diet pretty strictly and am desperate to eat again! Personally, I wouldn't bother with timing, but if you have the patience to try for several months and it will make you happier with your sway, go for it. Our last two attempts, we BD up until a day before O, but this month we BD through O. I also dropped the Sylk this month and used Rephresh only very sparingly. I think diet is the only thing that has scientific evidence to back it up, so I want to make sure I don't take too long to get pregnant, or I'll end up dropping the diet and my whole sway will fall apart.