I believe on Camino it is a little easier to break through those age-related pigeon holes. Just don't wait for others to make the first move. For example, rest stops provide a good opportunity to initiate some casual overtures, especially to other solo walkers, nothing too deep or meaningful or personal at this point. Just show interest in how their walk is going, are their feet okay, is their gear to their liking, what app are they using on their phone, where did they start from that day, how far they intend to walk. Just small chit chat. You will soon get a gauge of how amenable people are for further exchanges - many WILL be.
If you are staying in albergues, interactions with pilgrims of all ages will come easier and be more plentiful. But if you are staying in private accommodation it will be more incumbent on you to initiate overtures. Most solo walkers staying in private accommodation will likely be very amenable to an offer to join you, and others, for a meal. And it is at that point, often with the vino tinto flowing, that the deeper, meaningful exchanges that you enjoy can take place.