I ride a lot with my 27 year old son who recently moved back East from Austin, Texas. We have a great time but he is a whole lot faster than me and my regular riding buddies. I do find that I push a lot harder with him and that has put me in the middle when I ride with both him and my friends. I'm not as strong a rider as him but am stronger than the others. There are time when we are so spread out, we are all riding alone. No one has a problem with it and it's kind of like having the best of two worlds. Solo group rides is the description that come's to mind.
We are all long distance touring riders also and are doing the Erie Canal from Buffalo to Albany this summer. If you are over 50 and have never toured, it may be something to look into. It's very easy, and really a lot of fun. I don't really care for the group tours of hundreds of riders like those the Rails to Trails outfit offers. Nor do I care to ride alone. Touring with one or two friends I can highly recommend.
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No hands, no helmet, ear buds and talking on the phone. The "bike etiquette police" would have a field day with this one.