18+ simply means you must be 18 years or older to apply. For people like myself I tend to stick with partners that are older than 18 as they are usually more mature and comfortable with topics of drugs, sex, violence, and adult themes.

Personally I don't believe a tag 'range' is really worth investing in as this is afterall a roleplaying site, not a teen dating app; plus we are only talking about a 5 year variance. There's no reason to split that age group for reasons that have no impact on the writing level of the player.