For starters, 28 is not old. You're not even half as old as my parents, and they would insist that they're not old either.
Second, you're not almost 30. If you were 29 years + 360 days, then you'd be almost 30. By my calculation, you'll be "almost 30" in 723 days. A lot can happen in that time. You went from being a couple with Matt (i.e. not engaged) to married in approximately 485 days.
Enjoy each new birthday and the wisdom that comes with getting older. Besides, you don't look a day over 23. ;)
Just married - let the adventure begin!