Would a thread titled something like “Ask an Old” be helpful. It would not have to be old’s only answering, but it may be a fun way to get more engagement.
Also the older you get the older old becomes.
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Feel free to make a community, but many communities on that other site got their start on the larger ask sub.
There are a few asklemmy communities that have subscribers already. Start building an audience by posting fun questions there first to see what kind of engagement you get.