I've got back into mtb about 6 years ago after a 18year break.
Best thing I've done. I'm 44 and fitter than I've ever been. I get a good whack of adrenaline a few times a week. Plus it's great to get away from the sounds of the city.
Be prepared for some big injuries financially and mentally, it will happen if you like to push your limits.
I ride more now than I windsurf.
Still can't beat a good Gnaraloo day but that's not on the doorstep unlike these trails.
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Lucky im ok, was a hard fall. I was probably more hurt by a solid hip and shoulder to a pretty sturdy tree trunk that didnt move out of the way 
