The army is pretty busy at the moment with recruitment, they are being very selective so your age may be against you, saying that a 32 year old dude passed out at selection with me with an A grade in july last year. Saying that recruitment wasn't that busy then.
Best just pop in they are always up for answering any questions. Chance of recruitment also depends a lot on your trade, some trades are more empty or full than others, mine for an example is still looking for people I beleive, REME Armourer.