There's no birthday quite like the big 3-0. You're entering a different phase of adulthood, you're solidifying your sense of self, you're developing new and exciting forms of back pain… it's a big deal. So when a loved one is celebrating this momentous occasion, getting them the right gift is essential. Make sure it's something that says, "You're both youthful and mature."
This is an excellent birthday for "upgrade" gifts, or the fancy version of something they already love. If they've gotten really into wine...