Older housemates can be BB legends like "Dark Destroyer" aka "Derek" BB6 who was about 40ish. To be fair they've never put that many in over 40 years old over the twelve series. There have been many alarmingly mind numbingly boring housemates under 30 so more older housemates gets my vote.
Yes you could potentially get another Steve BB11, but you could also always potentially get another Louise BB12, Maysoon BB9, George BB7, Laura BB11, Kara Louise BB8, Sunita BB3, Imogen BB7, Ge
rgia CBB9 etc.
I'd like to see about four 40+ two male and two female, but not a couple and not related. On top of this about another four aged 30 something and again two male and two female. So make it 16 housemates on launch night, eight over 30 and eight under 30.