This will sound funny, but, you have to know your limitations, and if you go to a respectful Dojo, you would be fine. And not rolling with the people that seem like they have a point to prove. It doesn't take long to realize who they are either. I'll only roll with people I know. I'm 45, and started my journey in year 2000. Stand up sparring is a little different for me, as I can dictate whether we go or stop, but if some young buck catches you in a arm bar, you can only hope he doesn't rip your arm off.
Don't be discouraged by your age, just have to be smart about how and who you train with.
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