Ditto what 2016UPT stated. Get out there now and do what you can.
I interviewed with a unit summer of 2012 (age 27), received training dates summer 2013, officer school winter 2014, UPT summer 2014, graduated UPT 10 days before 30th bday in 2015.
However, why it took so long to get my training dates was the Gov't shutdown. But classmates at UPT (guard/reserve side) averaged about 2 year"ish" from interview date to UPT start date. May not be what you want to hear but that's the truth.
Did have a few guys over 30 at start of UPT but had age waivers (both were former aircrew and was told their bases fought to get those waivers)
Mine is just one, of many, different scenarios/timeslines it took to get into UPT. Hope it helps and best of luck
Note: since age isn't on your side and if you do get an interview, be sure to read through the interview questions thread on baseops. I read that front and back and all those insights are spot on with what they look for: good work ethic and good dude to hang with greatly outweigh perfect grades with shitty personality. A lot of great info on this website that I used to, luckily, get selected.