I don't think your age is an issue, your work speaks volumes besides digital cameras are new tech and people expect the younger generation to understand it an embrace it
At worst it may be a little awkward to start with but if you are calm, confident and friendly they will quickly learn you know what you are talking about.
Just some other thoughts:-
If you are going to do workshops I would type up some handouts which explain some of the basics of photography, exposure, aperture ISO etc also cover composition rule of thirds etc as that will give people something to make notes on and is a useful reference point.
Once you have a group try and find out in advance what they want to concentrate on and also suggest they bring there camera manual with them in case you aren't familiar with the model.
I would also suggest you try and limit the group size so you get familiar with how to communicate your technical knowledge effectively without confusing people with too much information to take on board.