"Age is just a number" as the cliche goes, and in trucking it couldn't be more true. Many, many people get into the trucking industry, and do well in it, at an older age.
The average age of American truck drivers is currently around 49 years old, and it is not uncommon at all for people in their 50's and 60's to get their CDL and start driving.
Many people get into it as a post-retirement career, or after their children have grown, or just as a way to travel while earning (experienced drivers find ways to do some sight-seeing along the way). As long as you are physically able to do the job, the trucking industry is happy to have you.
Tons. One of our most popular forum topics is the subject of age and being "too old to become a truck driver". The answer is always "No".
Many people go into the industry after retiring from law enforcement or the military. Many others are just switching careers later in life, or can finally go over-the-road after their children have grown up and left the house.
Really, the only difference for older drivers is that, by being human, the likelihood that you will be dealing with some kind of medical issues goes up as your age does. But as long as you can handle the physical part of the job, and pass the DOT and company physicals, there are no real obstacles for you.
Absolutely not. In fact, the FMCSA only places minimum ages for CDL drivers. Additionally, many companies also have a MINIMUM hiring age, due in part for a preference for hiring drivers with a bit more wisdom of age and experience (as well as for insurance reasons).