worth a go, but you will need to quit drugs/booze
totally and get fit very soon to pass the medical as you are fairly near the top accepted age group for a regular soldier (I think you may have as little as a year left to do this)
If I was in your situation I’d sell the rig, buy a load of gym kit with the proceeds and start working out now.. move away totally from anywhere there are drugs, I’d even wipe my phone numbers / MSN / email records and wouldn’t even bother with the last few months of the season…
the Army fitness training régime is here (in the Guardian of all places!)
http://lifeandhealth.guardian.co.uk/armyfitness