30, the simple answer to your question is "No, you are not
too old." I was 28 when I was commissioned and I've used
my age as an advantage. You will find that the maturity puts you
ahead of your peers and that you garner more respect from everyone
just by virtue of your age. I guess it's the "respect your
elders" thing but the maturity usually adds to the mix.
I was older than most going through OCS but made it
fine. And at TBS, I was teased a bit at the start of the 3 mile
run by the younger lieutenants with comments having to do with
Geritol and how they would meet me back at the finish line.
Not only did I clock the fastest time of my life (17:46) and
14 seconds faster than a decade-younger version of myself with
a DI on my heels, I blew away most of the other lieutenants.
When I got to my first duty station, I would take my
Marines out running and chastise them for not keeping up with
this old man lieutenant. They had a decade on me but I still
out-performed every last one. I also played on the battalion
football team (full pads, full contact) and was one of only
4 officers to even try it. Yes, I got beat to hell but I was
out there and they saw that. It really gives you an edge to
hit them psychologically with the age thing.