51 year thinking about getting into the biz

Hi,

I'm 51 yr old. Been out of work for 20 months, was thinking about getting into this biz. I was in the printing industry for 25 years but thats going away and whats left going to younger people. Pretty sure there's lots of truckers my age but is it to late to start? And how mechanical do you need to be? My niece was a trucker for awhile, and I don't think she was rebuilding trannys.
thanks