I could never do them as a child and was notoriously inflexible. At the age of 29 I developed the urge to achieve it. It was during a period when I was exercising several times a week - dance class, netball etc. So what I did, at the end of every session while I was well and truly warmed up, I just practiced going as low as I could, hold for as long as possible and then try to relax a little more into the stretch. I can't remember how long it took, but I did get there, to my own amazement!!! I think the key was learning to relax into the stretch rather than "work harder" to stretch more. I never understood this concept before childbirth classes, lol. So good luck, I think it is achievable.