Hi Gary, and welcome to the forums!
There is no lower- or upper age limit for having fun. And DJing is just about that – having fun, and giving a good experience to your audience. Your age only comes into question if there are health concerns in play, but knowing your own limitations will probably take care of that for you.
If you’d like to brush up on techniques and basic knowledge, just to get on the same page as “everyone else”, I highly recommend the DJ courses here aimed at beginners. It’ll give you a simple and logical rundown of what’s what in todays world of digital DJing.
We’d love to hear more about your journey, so keep us updated – and don’t be afraid to use the forum to ask questions and dig into the dirty details of DJing.
Best of luck!
– Tord