Let’s see, the equivalent subreddit’s rules are

• Respondents to posts must be “old”: Born 1980 or prior
• Please do not seek personal advice or emotional support here
• Posts must be 300 characters or less
• No surveys or homework help
• Be cool to one another

although they have had the same cutoff of 1980 for a few years now. If Lemmy actually grows enough for this to matter at all, it would be best to select an age instead.