Happy birthday beingthehero.
Try not to worry about how old you feel when you're only 24. Technically you still have six years before you have 1/3d of your life over with. I'm only 33 but it's kinda funny in a way. I feel old but at the same time I feel like a kid (not in the good way mind you as I don't have all that expendable kid energy). So for me it feels like I'm stuck in limbo and I don't really know what to do about it, let alone how to interpret it.