There is not best age - just as there was no best age to force her to learn to walk.
Get a good potty training book or check out BabyCenter.com for readiness signs. Once she has at least half of the signs, you can start. Until then, you can do pre-training things like teach her the words you want to use, teach her to sit still for storytime, let her watch you.
If she is potty trained by 30 months (2.5 years), she's ahead of the curve. But even if she's not, remember that half of all baby's learn after 30 months.
at 12:13 AM on Jul. 6, 2008